arrow side square groove with a fillet weld. A brief description is provided on the typical reason for minimum weld spacing requirements applicable to each configuration. When depositing intermittent fillet welds, the welding symbol can be interpreted as: a) Weld size is the minimum size. Para definir el tipo de discontinuidad, junto a Tipo. 1 in. By contrast, spot welding create a permanent, final joins in the materials and is. 11. edge joint, 3. for high tensile steel (70ksi tensile). If you need assistance, you may contact LABOR Monday-Friday 8:30 AM - 4:30 PM, at the following telephone numbers: 410-230-6231 or toll free 1-888-218-5925. April 2020 Half-Inch-Diameter Grade A325 Bolts Weldability of Structural Steel Base Plate Load Distribution. notes. 1 Drawings. Inside stiffening ring attachment welds may be intermittent welds on each side of the ring with. Intermittent fillet welds essentially produce patterns of the weld bead along a set of edges. Notice the length of the weld is<br />The optimal weld spacing and weld length for intermittent welding of angle steel to reinforce rectangular steel tube columns provide a theoretical reference for the design and application of practical reinforcement engineering. What is the recommended maximum intermittent weld spacing for a tension member? Section D4 of the AISC Specification for Steel Buildings (ANSI/AISC 360) refers to Section J3. The difference must be assumed to I am using intermittent welds to connect two shapes. Seam welds can be classified as either Intermittent Seam Welding or Continuous Seam Welding, depending on the length of the weld and the spacing between welds: Intermittent Seam Welding: In intermittent seam welding, the weld is formed at intervals along the seam, with spaces between each weld. Four times the weld size d. The use of intermittent welding instead of continuous welding reduces the welding workload on the construction. Staggered intermittent welds are given with the staggered Z symbol. AWS A2. 7. Intermittent Technique Welding Also known as stitch welding or skip welding, intermittent welding involves spacing out your welding points rather than having a long, continuous weld along the area. Design stresses for welds made with mild-steel. Overview. 37 kN/mm per weld. However, the AWS Specification imposes additional restrictions on the intermittent weld spacing. 12. 4 Plug and slot welds are not to be used except where access to both sides is not possible. reference line. staggered intermittent weld. i recently came across the following: -for intermittent welds. As per IS: 800-2007, Clause 10. 4. What is the weld joint that is formed when two parallel members overlap each other? Groove faces. This project includes a review of the present weld spacing requirements in various national and international above ground storage tank and pressure vessel codes and standards, as well as the past. For intermittent welds, the length of each portion of the weld and the spacing of the welds are separated by a dash (length first, spacing second) and placed to the right of the fillet weld symbol. In the example you offered, the minimum length of each increment is 2 inches. License Type: 01-P. occurs on both sides of the joint, with weld increments on one side alternated with respect to those on the other side. T/F. Intermittent Technique Welding. (600 mm). 11. Welds to be made in the field are indicated by a darkened triangular flag at the juncture of the reference line and arrow. Therefore, with the increase of the strengthened weld spacing, the slenderness ratio of the angle steel between the short welds significantly increases and the. the intermittent weld length, L (2 inches for each built-up column in Table D-10) and maximum center-to-center intermittent weld spacing, s max needed to ensure composite behavior of the columns. Eight times the weld size 7 In addition to the above limitation, what is the minimum length for intermittent fillet welds? a. The pitch of intermittent fillet welding shall be shown to the right of the length dimension (A, fig 3-27). Changing from mild steel to AHSS may also result in a change of arc blow. In a single V-groove weld the sloped surfaces on which the weld metal is appli are called. b. says a sketch of the required weld should be shown. 2. You must be able to calculate the spacing between weld stops and weld starts in order to apply the correct welds to the specification. The weld joint formed when two parallel members overlap each other is called. (center-to-center spacing) of an intermittent weld (formerly<br /> known as a skip weld) is expressed as the distance<br /> between centers of increments on one side of the joint. The spacing between the continuous and intermittent welds in Figure 3-20, view B, equals the pitch minus the length, or 6”=2" = 4”, as shown. Angles, Diameters – Intermittent Tab • Toggle Intermittent on/off • Number of Welds/Weld Spacing – Options Tab • Cross Section (used for mass props) • Default Welding Rod • Default Weld Process • Finishing options – Properties Tab • Default Parameters. To set the intermittency type, next to Type, select an option: Linear —Use linear pitch (distance between weld segments). An open chain will always have a weld segment in the beginning and the end of the edge chain. (40 mm). 45 degrees. In general, the results of these studies demonstrated that various factors like plate slenderness of each plate element, depth of the beam, geometry of the corrugation, intermittent weld spacing. staggered intermittent weld. There is a weld at the start of the trajectory, and a space at the end. To perform the skip weld technique, a welder will make a series of intermittent welds, or stitch welds. ISO 2553:2019(E) Introduction The symbols given in this document can be used on technical drawings for welded components. Pitch of the weld. 2. 8. Easily calculate the pitch between weld beads as well as bead quantities and lengths for your intermittent and stitch welding projects. 1. This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Keying values 3 – 6 for length and pitch imply 3 weld deposit and 6 as the centre to centre spacing of each stitch. The first bridge welding. longitudinal ductility increases. What is the term that refers to the center-to-center spacing of an intermittent fillet weld? Lap. different thickness, stiffener spacing, number of attachments, corrugated con-struction, mechanical restraint condi-tions, assembly sequence and overall construction planning. Two different tube diameters are used in the experimental study. (a) 118 mm (b) 236 mm cover plates 250 x 12 40 kN/m 200 UB 25 Icx 23. center to center of a weld. Intermittent welding was applied between the circular steel tube and the casing, and the weld length and weld spacing were 100 mm and 500 mm, respectively. The pitch is the distance between centers of segments on one side of the joint. minimum angle allowed for a groove. 17, modified — Note 2 to entry has been adapted. When two parallel members overlap each other it is called this. a. What be due (at least in part) to the magnitude of the loadInstead of continuous flange-to-web weld, intermittent fillet welds are sometimes used, as shown in Fig. Minimum length of Intermittent Fillet Welds: (Clause 4. 4 you are not considering the distance. End with gap —Distributes the weld segments so every weld is followed by a gap. The pitch of resistance spot welds shall be shown to the right of the weld symbol (fig. intermittent weld segment us ed was 20mm; t he largest weld size is in 25mm bars, in which four weld sizes is 18mm as min. Lap joint. Intermittent welding is used when either a continuous weld is not necessary, or when a continuous weld threatens the joint by warping. Available for flare V groove and butt welds and flare bevel groove and butt welds. March 2020 Plumbness and Straightness Tolerance Moderate and Highly Ductile Member Requirements in the Seismic Provisions. 75√29,000 ksi 36 ksi } = 7. 5 Number of spot welds. About us. 2) 8 mm. space between weld segment will be 6inch . c. -for intermittent welds, length shall not be less than the greater of. 2. g. The engineer need only spec-ify “CJP” in the tail of the weld symbol when such a weld is required, as shown in Figure 3. 75 29000 50 (1. In another response regarding the interpretation of the intermittent weld symbol, there are no implied tolerances. 1 in. * As far as tolerancing, we use 2-place dimesnional tolerances (per our table of allowances in the title block) to tolerance the weld length and/or weld spacing. Thus, the same amount of weld material can be applied in a continuous weld in less time and for a better result. The weld size (depth of the weld) is shown to the left of the weld symbol in parentheses. However, if the size of the fillet weld is not even, designers can use two numbers in the form of, e. However, if the size of the fillet weld is not even, designers can use two numbers in the form of, e. When intermittent resistance seam welding is used by itself, the symbol indicates that increments are located at the ends of the dimensioned length. Welding symbol for intermittent and staggered welds. What is the recommended maximum intermittent weld spacing for a tension member? Section D4 of the AISC Specification for Steel Buildings (ANSI/AISC 360) refers to Section J3. The Toe. There is a weld at the start of the trajectory, and a space at the end. bottom c. Option 1: When prompted, press enter or right click (return) and the user can enter bent plate setbacks. It should be noted, the configurations that include sleeve end fillet welds are also applicable to the circumferential welds at the. 10) 50 times. 1¼ in. 5. 2 thru 9. (such as halving bolt spacing, welding. 4. , Plug. 4-98, Standard Symbols for Welding, Brazing, and Nondestructive Ex - amination, but is included for information purposes only). A weld applied to the other side of a joint before a groove weld is started is called. 1 GMAW Process Additional information regarding gas metal arc welding can be found in the AWS Welding Handbook, Eighth Edition, Volume 2, Chapter 4, Gas Metal Arc Welding. 9 As an alternative to intermittent welding, single sided welding may be used. Type or select a value for distance between intermittent weld. Important vari-. We have 4 CWI folks here but not all agree on this issue. Therefore, with the increase of the strengthened weld spacing, the slenderness ratio of the angle steel between the short welds significantly increases. (411. 85. Bead Quantity = 3. The weld spacing varied from 10 to 50t where ‘t’ is the tube wall thickness. Maximum clear spacing between the effective length of the weld: AS 1101. The pitch of an intermittent weld is the ______. -eor to confirm intermittent weld spacing. designer. Thanks Al, so in the code when it refers to spacing is that the spacing from the end of one weld to the start of the next weld or is the spacing on center of each weld, i did see the in 2. There. [SOURCE:ISO/TR 25901-1:2016, 2. 3. To set the method for distributing the intermittent weld segments along the trajectory, next to Weld spacing, select an option: End with gap —Distribute the weld segments so every weld is followed by a gap. In some cases intermittent welds are staggered on both sides of the joint. To make the weld intermittent, select the Intermittent weld check box. Several years ago I received an interpretation from the A2. Note! Note: Weld symbols on the full reference line relates to welds on the arrow side of the plate being welded. Per impostare il metodo per distribuire i segmenti di saldatura intermittente lungo la traiettoria, accanto a Spaziatura saldatura (Weld spacing), selezionate una delle opzioni seguenti: Fine con gioco (End with gap) - Distribuisce i segmenti di saldatura in modo che ogni saldatura sia seguita da uno spazio vuoto. 2 GMAW Process Limitations for Chassis Structure Gas metal arc welding closer than 25 mm to surfaces. Inst. Depending on beam size (must be at least a W10 to have b f = 10") space the pairs every couple of feet, or so. An intermittent fillet weld is a fillet weld that is made in short segments, with gaps between the segments. March 2020 Plumbness and Straightness Tolerance Moderate and Highly Ductile Member Requirements in the Seismic Provisions The ½” fillets are probably/usually 3 or 4 pass welds depending on the welder and weld process used, and all the starts and stops are difficult to make well and to inspect. 13. A dimension to the left of a groove weld symbol that is in parentheses indicates the depth of bevel. 2-1). W. 16 Intermittent Welds Maximum weld spacing for intermittent welds in AISC Specification Sections D. Typical Length and Spacing of Intermittent Welds Table and Formula ; Selection and Design of fillet weld sizes by rule-of-thumb; Strength of shielded-arc flush steel welds table; Welding Definitions; Weld Drawing Symbol; Weld Symbols, ANSI/AWS A2. 14 15. Eight times the weld size 7 In addition to the above limitation, what is the minimum length for intermittent fillet. a) the weld size specified by the welding symbol is the minimum weld size. without the weld (the skip). 3 Intermittent and zig-zag fillet weld symbol. As the weld length is increased, the weld throat may be propor-tionally decreased if the loading remains the same. ¾ in. 2). This will be more common with thicker material when it is a lengthy weld. The weld is then machined flat to the member surface. The difference between a spot weld and a tack weld are that a tack weld is a temporary initial step to position work pieces and ensure the correct alignment for the final weld. 欲設定沿軌跡分佈間歇焊接段的方法，請在 「焊接間距」(Weld spacing). _____ effects the strength of the weld. 1 2004 2. 653, 9. The results showed that the weld spacing of 10t gives the highest load holding for theThe recommended procedures for handling special cases of connections (partly penetrated welds, intermittent welds, combined welds) can be found in the theoretical part of the Help. 8 For a fillet welded T-joint, what is the maximum gap allowed between pieces before the weld size must be I posted this on the other site… I’ve generally used weld spacing of: -FOR INTERMITTENT WELDS, LENGTH SHALL NOT BE LESS THAN THE GREATER OF 4 TIMES THE WELD SIZE OR 40MM. A-12 . Verification Examples. Weld symbols on the dashed line relates to weld on the far side of the plate. c. If you mean intermittent fillet weld, I know what that is. 4:2007 An American National Standard Approved by the American National Standards Institute March 23, 2007An edge weld can also be welded in this same manner. Groove welds. top d. In other words, the three criteria the inspector should look at are: 1) The minimum size of the fillet - as specified by the welding symbol. Longitudinally stiffened panels – A comparative with regards to stiffened plates with chain intermittent welding, analysis of the compressive strength of three common construction methods. Despite the increased alloying content used for AHSS, there are no increased welding imperfections compared with mild steel arc welds. 6. I can't seem to set a negative start point, and the 'center welds' option seems to be broken. In an open root v groove pipe weld, root reinforcement should be flush to within. To set the intermittency type, next to Type, select an option: Linear —Use linear pitch (distance between weld segments). weld toe B. g. max clear. 77 = 50 in. INTER_STAGGERED. There may be a staggered intermittent edge weld as well. With intermittent weld symbol does the pitch and spacing need to be on both sides of the reference line, Also is their Aws documentation that shows this. 11. 4 (standard symbols for welding) defines the intermittent weld callout as length-pitch. It is generally applied to studs ranging from 1. Intermittent watering was done and within a few days’ time, a green cover was fostered. Numbers to the right of a symbol or symbols relate to the longitudinal dimension of welds, eg for fillets, the number of welds, weld length and weld spacing for non-continuous welds (e. The pitch (center-to-center spacing) of an intermittent weld (for- merly known as a skip weld) is expressed as the dis- tance between centers of increments on one side of the joint. Maximum clear spacing of intermittent weld shall be 12t for compression joint and 16t for tensile joint, where t is thickness of thinner plate. welds are to be sound, uniform and free from slag inclusions, porosity, undercutting or other defects. Instead of creating a continuous weld, intermittent fillet welds are spaced apart, leaving gaps between each weld. The diagram below illustrates the various elements making up the weld symbol. Explanation: In welding, whether a weld is made continuously or intermittently depends on the specifications of the particular job. strength of a weld is proportional to the weld throat and length. The welds are 6 mm intermittent of length 24 mm and the permissible shear stress in the welds is 120 MPa. Use as few weld passes as possibleYou can create intermittent welds for fillet welds, groove welds, or butt welds. E. Chain intermittent welding is better than staggered intermittent welding. Use intermittent welds. I don't see any mention of stiffeners in Newman's on-line notes. 2. 2. If we denote the length. The pitch of intermittent fillet welding shall be shown to the right of the length dimension (A, fig 3-27). 7 Fillet Weld Terminations 2. line. The stud welding process is used to attach studs to a component in order to locate or secure other parts. The duration and spacing of the welds can vary widely based on the application. basic weld symbols. Pitch P Center to center spacing of intermittent or staggered welds. F Zone: Marks the field weld symbols and. 9. 7 Attachments to tank exterior surfaces shall be as follows. 6mm (1/16in) to 19mm (3/4in) in diameter. The weld recommended reduce the effects of shrinkage is a simple welding sequence with short welds. The longitudinal spacing between intermittent fillet welds connecting two or more rolled shapes shall not exceed 24 in [600 mm]. To set the method for distributing the intermittent weld segments along the trajectory, next to Weld spacing, select an option: End with gap —Distribute the weld segments so every weld is followed by a gap. The center-to-center spacing (pitch) of a plug weld is shown to the right of the weld symbol. A stringer bead is used to create a wider weld pool. Dimensions that may be added to the edge weld symbol are size, length, and spacing (pitch of intermittent welds). 6 Grouped spot welds. 2. NO * YES. Reference Line: The horizontal line which is a required element of a welding symbol. They are certainly an inferior weld for fatigue conditions. Intermittent welds are advantageous with light members, where excessive welding can result in straightening costs greater than the cost of welding. , Plug. " -for intermittent welds, length shall not be less than the greater of 4 times the weld size or 40mm (1-1/2”). 2. April 2020 Half-Inch-Diameter Grade A325 Bolts Weldability of. The edge weld symbol shall only be used in. true. Length of welds if the weld does not span the entire joint or if the welds are intermittent. For example there are studs for concrete. Gas Metal Arc Welding (GMAW) Process 2. If the weld is made using E70 (E48) weld metal (70 ksiWhen specifying the length and spacing of intermittent edge welds, the dimensions are placed to the ____ side of the weld symbol. If the beam is loaded as shown, determine the required weld spacing at (a) ends and (b) quarter points of the span. The change in axial strength is 13% when the weld spacing is reduced from 50 to 10t. Study with Quizlet and memorize flashcards containing terms like 1. Groove Weld Symboldimension (center-to-center spacing of welds) is placed to the right of the length dimension and separated by a hyphen. There is a weld at the start of the trajectory, and a space at the end. butt joint C. 2) 8 mm. I would not be overly concerned about spacing the plug welds. In general, the results of these studies demonstrated that various factors like plate slenderness of each plate element, depth of the beam, geometry of the corrugation, intermittent weld spacing, and number of mono-profiles used in the construction of the beam influenced the flexural response of such elements. 13 Intermittent flange-to-web fillet weld Design of Plate Girders 24 of each portion of the fillet weld by L1 and the spacing of the intermittent weld by a1, the following relation holds between these two variables: L1qa = a1q (9. An intermittent fillet weld is a type of weld that consists of a series of individual welds made at intervals along the length of a joint. 7. They can be one-sided or two-sided, symmetrical or asymmetrical. 2. 8). , 2. The note in the tail, "2 places", would indicate there are two identical joints that require the same extent, type, and size of intermittent weld. for compression member - 12 * thickness of thinner plate (t thin) or 200. 2 Intermittent welds between continuous welds. Engineering. WELD_SPACING. To set the method of distributing the intermittent weld segments along the trajectory, next to Weld spacing, select an option: End with gap —Distribute the weld segments so every weld is followed by a gap. Study with Quizlet and memorize flashcards containing terms like for multiple joint seam welds where one or more pieces are inserted between the two outer members the same symbol and elements are applied to specify the weld as used for the two member joints regardless of the number of pieces inserted, the seam weld symbol may only have an. May 2020 Column Eccentricity Intermittent Fillet Weld Spacing for Tension Members Beam Stability Bracing. Start point for intermittent weld segments. ¾ in. for tension members, the max clear spacing between welds shall not exceed 18” (csa w59 11. AWS A2. There may not be enough room for<br /> another intermittent weld. The primary element of any welding symbol. If the weld is only to be intermittent on one side and a continuous weld on the other the symbol must be dimensioned individually. 線性： 角度： 「以焊接結束」(End with weld) - 以對稱方式從軌跡的中間開始分佈焊接段，使軌跡的起點有焊接，終點也有焊接。間. In welding during the part fitment stage, the appropriate size of tack welds is crucial in joining work pieces together. The size of the weld is given to the left of the basic weld symbol and the length to the right. 3. In intermittent welding mode, the weld length was 20 mm and the weld spacing was increased from 29 mm to 960 mm. Pour définir le type de discontinuité, en regard de Type. 6 Intermittent Fillet Welds (Minimum Length). 1/D1. But we can’t. The weld spacing/pitch are to be considered *minimums. y For two rolled shapes in contact, the maximum longitudinal spacing of bolts or intermittent welds should not exceed 24 in. The pitch (center-to-center spacing) of an intermittent weld (for- merly known as a skip weld) is expressed as the dis- tance between centers of increments on one side of the joint. 5) (7420)/446. I recently came across the following: -FOR INTERMITTENT WELDS, LENGTH SHALL. The pitch (center-to-center spacing) of intermittent fillet welding shall be shown as the distance between centers of increments. There is a weld at the start of the trajectory. 線性： 角度： 「以焊接結束」(End with weld) - 以對稱方式從軌跡的中間開始分佈焊接段，使軌跡的起點有焊接，終點也有焊接。間. Provide an intermittent 6mm fillet weld on both sides of the web, 90 mm hit and 110 mm miss. Para hacer que la soldadura sea intermitente, seleccione la casilla Soldadura discontinua (Intermittent weld). It's likely a plate thickness and member width to weld spacing limit where local effects will bridge the fasteners (i. Maximum increase is found to be 21% corresponding to 10t spacing. 5". 17. In general, the results of these studies demonstrated that various factors like plate slenderness of each plate element, depth of the beam, geometry of the corrugation, intermittent weld spacing, and number of mono-profiles used in the construction of the beam influenced the flexural response of such elements. 3 kN, τ = 350 ms; B -of the HDG DP steel with d 0. The test specimens were made of Q235 steel with total length of 3000 mm. Under run (undersize) is as permitted by the. Proc. 断続溶接セグメントを軌道に沿って分布する方法を設定するには、 「溶接間隔」(Weld spacing) で、次のオプションを選択します。 「ギャップで終了」(End with gap) - すべての溶接の後ろにギャップができるように溶接セグメントを分布します。Pour rendre la soudure discontinue, cochez la case Soudure discontinue (Intermittent weld). There is a weld at the start of the trajectory, and a space at the end. 13. A joint formed by placing one piece of metal against another at an angle of approximately 90° is called a(n) A. In front of the symbol place the number of welds followed by the weld length - after the symbol, place the spacing between welds (In brackets) 3 x 75 / (150) Again, If the number of welds are either not known, or not necessary, simply leave blank e. 1. 2. 2 Transverse skewed butt weld - Such weld shall not be assumedYou can manually add welding symbols, caterpillars, and end fills to any edge in a drawing view. 0 in o. e. Eight times the weld size 7 In addition to the above limitation, what is the minimum length for intermittent fillet welds? a. 4. Each weld bead is two units long. a hollow structural shape, a square or rectangular bar, etc. (2 mm), provided the weld size is clearly verifiable. Part B, Brazing Symbols, uses the same symbols for brazing that are used for. Depending on the loading and use the fillet welds can be intermittent. g. . ____ 4. These gaps are typically equal to or greater than the size of the weld itself. Chain intermittent the welds on both sides of the joint are opposite each other and resemble a chain. Intermittent welds or also called skip welds are weld seams with unwelded spaces in between. The Specification calls for a minimum weld length of 1. Prior to 1976, the sketches included a note that the intermittent fillet weld started with a increment (or segment) at one end of the joint. Twice the weld size c. To define the default weld dimensioning scheme, click the Shape tab, and select an option: A, and then type a value for the distance from the weld surface to the. “焊缝接头”(Weld joints) 表 - 对于仅具有曲面参考的焊缝，可列出创建焊缝几何时轨迹中包括或排除的接头 (轨迹部分)。 对于每个接头，可以定义接头起点、修改接头终点以及将焊缝符号附加到特定接头。适用于喇叭形坡口和对接焊缝以及半喇叭形坡口和对接焊缝。Fig. Design-related specifications, such as type, thickness, and length of weld, weld quality, surface treatment, filler3-19. An easy way to find this distance is simply subtract the pitch from the weld length (segment. c. 38) Substituting for q and qa form Eqs. 5 in. April 2020 Half-Inch-Diameter Grade A325 Bolts Weldability of Structural Steel Base Plate Load Distribution. 2-4 in the below symbol) where the first digit shows the weld length and the 2nd digit means spacing between the intermittent welds. a. Spacing, extent, orientation, and location of arc. 1 but, that doesn't change the "sealing" issue in the commentary. T Dik, You are correct. 2. 2. 2. Staggered Intermittent weld — Appears for the ISO and DIN standards. The pitch would be the spacing of the intermittent welds, generally center to center. 4. y For two rolled shapes in contact, the maximum longitudinal spacing of bolts or intermittent welds should not exceed 24 in. For intermittent welds, a dash separates the length of each portion of the weld and the spacing of the welds (length first, spacing second). What is the term that refers to the center-to-center spacing of an intermittent fillet weld? Lap. However, intermittent welding does not reduce drastically the angular distortion of the stiffened plate, in comparison with the continuous welding [12]. Stud Welds. You can create continuous or intermittent fillet welds. P: If welding is intermittent and spacing between the welds is indicated, then this Indicates the Pitch Spacing or Center-to-Center Spacing of the weld; N: Indicates the Number of Welds (Spot, Seam, Stud, Plug, Slot or Projection) required. Aug 03, 2020 10:07 AM. Fig. The intermittent weld symbol is intended to ensure the weld is "strong" enough to transmit the load from one member to another. 3: “Intermittent PJP groove welds, flare bevel, and flare-grove welds may be used to transfer shear stress between connected parts. 5. , Dimensions that may be added to the edge weld symbol are size, length, and spacing (pitch of intermittent welds). 1M:2002, Structural Welding Code—Steel, but is included for information purposes only. C. For joints requiring more than one weld type, a symbol shall be. 3. 線性： 角度： 「以焊接結束」(End with weld) - 以對稱方式從軌跡的中間開始分佈焊接段，使軌跡的起點有焊接，終點也有焊接。間.