weld back-up

Tensile strength of back weld was higher than base metal, so back weld joint ruptured in the base metal in the experiment. The micrograph of fracture indicated that it was dimple fracture.

打底拉伸强度高于母材，接头断裂在母材处，焊缝断口呈韧窝型剪切断裂。

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The main features are that the back surface weiding seams are even, smooth and weld edge tidy, excellent in performances of welding technology and welding seam dynamics. Unique output special design can suit wire filling welding and form good-looking welding seam.

主要特点是背面焊缝匀称、光滑，焊趾整齐，焊接工艺性能及焊缝力学性能优良。独特的输出特性设计更适合填丝焊接，焊缝美观。

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A closed-loop control system with welding current as control parameter is founded to control the width of isothermal line of back-side welding temperature field in TIG welding of thin plate. The control of penetration and width of back side weld is achieved.

以焊接电流为控制量，研制了薄板钨极氩弧焊（TIG）背面温度场等温线宽度闭环控制系统，实现了对焊缝背面熔宽和熔透的控制。

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This paper introduces the weld line of car back bridge of small size cars, as well as the welding techniques and characteristic of ensemble forming of bridge shell.

介绍了微型车后桥壳装焊线，桥壳整体成型的焊接工艺与特点。

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