SMTC 21549?2010
10 焊角不等边性 B h≤1.5+0.15 a mm 必须保证最低熔深 11 No. Flaw name Description Limit value of irregularity Evaluation Stipulated value grade 1 2 3 4 5 6 Crack C Not allowed 1% h≤0.3a mm Not allowed h≤0. 3a mm Not allowed h≤0. 3a mm Not allowed Not allowed if being lower than the minimum fusion penetration Void factor and gas 1） Maximum sizes of all gas holes on B hole projection plane or refracting plane 2）Maximum size of a single gas hole （2）焊接飞溅 B 参见3.1.2节 B B Gas channel and strip 1) Long irregularitygas hole Mixed (except for 1) Long irregularitycopper) Infused Inadequate penetration 2）Short irregularity（1）B B （2） Stipulated penetration Actual penetration 2）Short irregularity（1）B C B 17
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7 Clearance mB h≤0.5+0.1 a mm 2 mm at maximum atching 8 Overlapping B h≤0.5mm 9 Too big height surplus B h≤1+0.1b mm 3 mm at maximum 10 Leg scalene B h≤1.5+0.15 a mm guarantee minimum fusion penetration 11 （1）Welding spatter B Refer to Section 3.1.2 短的不规则焊缝：每100 mm焊缝长度上总长度不超过25mm的一个或数个不规则焊缝，或焊缝长度不到100mm时最大尺寸为总长度25%的不规则焊缝。 （2）
长的不规则焊缝：每100 mm焊缝长度上总长度超过25mm的一个或数个不规则焊缝，或焊缝长度不到100mm时最大尺寸超过总长度25%的不规则焊缝。 （1）
Welded seam of short irregularity: There is one or several irregular welded seams less than 25mm on welded seam every 100m, or irregular welded seam exceeding 25% of the longest size on welded seam less than 100mm long. （2）
Welded seam of long irregularity: There is one or several irregular welded seams more than 25mm on welded seam every 100m, or irregular welded seam exceeding 25% of the longest size on welded seam less than 100mm
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long. 缩写符号：
Abbreviation symbol: a— 额定焊缝厚度尺寸 b— 焊缝余高的宽度 h—焊缝缺陷尺寸
s—局部焊弧穿透时的熔深 z—焊角长度
a—thickness of rated welded seam
b—width of surplus height of welded seam h—Flaw size of welded seam
s—fusion penetration of partial welding arc in penetration z—leg length
3.3.4 点焊的评价
3.3.4 Spot welding evaluation
3.3.4.1 不允许有有害的气孔，夹杂，裂纹，深的凹陷，大的倾斜角等缺陷，具体按照表4的标准评价。 3.3.4.1 There should be no harmful flaws such as gas hole, foreign substance, crack, deep sagging, and big oblique. Evaluation is based on standards in Table 4. 表4 点焊缺陷评价
Table 4 Spot Welding Flaw Evaluation No. 名称 1 2 3 4 5 压入深度tE 熔核内部的气孔直径dpore 合格 （标记1） tE≤0.2t dpore≤0.1dL 凿检试验合格 允许在粘结区域内 允许出现在： 熔核中心 粘结区域范围 熔核边缘和垂直于接缝表面 L＜0.15mm（垂直于接缝表面测量） 0.50≤L≤0.80 L≥0.15mm L＞0.80mm 带条件合格 （标记2） 0.2 t＜tE＜0.3 t 0.1dL＜dpore＜0.2dL 凿检试验合格 0.2dL＜h＜0.25dL 不合格 （标记3） tE＞0.3t dpore≥0.2dL h≥0.25dL 熔核内部硬化裂纹（延伸） h≤0.2dL 铝杂质 氧化物析出 6a 6b 7 表面裂纹：在电极压入的边缘范围内 表面裂纹：在电极压入的边L＜0.50mm 缘范围中心（中心Ф0.2 dL） 微裂纹 不允许： ·与焊缝平面平行变化并且进入熔核内部 ·在熔核边缘上，并且垂直于接缝平面变化 ≤200 Qualified （Mark 1） tE≤0.2t / Conditionally qualified （Mark 2） 0.2 t＜tE＜0.3 t ＞200 Unqualified （Mark 3） tE＞0.3t 19
8 倾斜角 No. Name 1 Pressed depth tE
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2 Diameter of gas hole in dpore≤0.1dL dpore≥0.2dL 0.1dL＜dpore＜0.2dL nugget dpore Qualified in Qualified in chiseling chiseling inspection inspection Internal hardened crack of h≤0.2dL nugget (extension) Aluminum impurity Oxide precipitation 0.2dL＜h＜0.25dL h≥0.25dL 3 4 5 Be allowed to appear in the sticking area Be allowed to appear in: Nugget center Scope of the sticking area Nugget edge and vertical with seam surface 6a Surface crack：within the L＜0.15mm（measurement vertical with seam L≥0.15mm edge scope of electrode surface） pressing Surface crack：within the L＜0.50mm edge scope of electrode pressing（center Ф0.2 dL） Micro-crack 0.50≤L≤0.80 L＞0.80mm 6b 7 Be not allowed to： ·Change in parallel with the surface of welded seam and enter nugget ·Be on the edge of nugget and change vertical with the surface of welded surface ≤200 / ＞200 8 Oblique
结果评定：
Result evaluation:
标记1 = 合格
标记2 = 尚可用，但必须要改善 标记3 = 返修（如果允许）或报废
符号含义：t - 板厚 h - 缺陷长度 L - 裂纹长度
Mark 1 = qualified
Mark 2 = be still usable, but remain to be improved Mark 3 = rework (if allowed) or rejected
Symbol meaning: t – plate thickness h – flaw length L – crack length
3.3.4.2 点焊必须满足表5中规定的要求
4.3.4.2 Spot welding should meet requirements stipulated in Table 5.
以剪拉力，凿检和/或以熔核直径和熔深检查为主的检测应分别按照下面的要求评价。
Inspections focusing on shearing tension, chiseling and/or nugget diameter and penetration should be evaluated according to the following requirements.
—合格：焊点可以从母材剥离或焊接满足试验载荷： F≥Fmin F—剪拉力（kN）。
—Qualified: welding point can be separated from base metal or welding meets test load: F≥Fmin F— shearing tension（kN）
焊点直径dp 满足：dp≥dpmin 熔核直径dL满足：dL≥dL min
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熔深tL 满足： tL≥0.2mm
无环形熔核。
Welding point diameter dp: dp≥dpmin Nugget diameter dL: dL≥dL min Penetration tL : tL≥0.2mm No ring nugget
备注：环形熔核指熔核中心区域未熔合或熔合很少。
Nugget: ring nugget refers to the fact that the central area of nugget is not fused or slightly fused.
—不合格：满足下列条件之一即为不合格。 —Unqualified: one of the following conditions.
焊接分开，而焊点没有从母材剥离。 剪拉力：F＜Fmin
焊点直径dp ：dp＜dpmin 熔核直径dL ：dL＜dL min 熔深tL ： tL＜0.2mm
存在环形熔核。
Welding is severed, and welding point is not separated from base metal. Shearing tension：F＜Fmin
Welding point diameter dp ：dp＜dpmin Nugget diameter dL ：dL＜dL min Penetration tL ： tL＜0.2mm
There is ring nugget
说明：1）、当图纸规定的要求高于本标准时，按照图纸规定的要求执行。
2）、在检测以及行驶试验结束后，决定有缺陷的焊点是否允许接受，并吸收到图纸中去。
Note: 1) When requirements stipulated in the drawings are higher than the standard, the requirements shall prevail.
2) When the inspection and driving test are about to complete, it should be decided whether welding points with flaws can be accepted, and absorbed in drawings. 表5 点焊的要求
Table 5 Spot Welding Requirements
最小板厚tmin mm 1.0 1.2 1.5 2.0 2.5 3.0 3.5 4.0
熔核直径dL min≥3.5 √tmin mm 3.5 3.8 4.3 5.0 5.5 6.1 6.5 7.0 焊点直径dpmin = 1.2dL min mm 4.2 4.6 5.2 6.0 6.6 7.3 7.8 8.4 最低剪拉力Fmin kN 3.2 4.2 5.1 7.2 10.5 12.4 15.0 18.5 21
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