Laser Lap-Welding of Stainless Steel to Cu Alloy.
Laser Lap-Welding of Stainless Steel to Cu Alloy.
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不锈钢与铜合金的激光搭接焊。
DOI：
10.2207/qjjws.17.420
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Tsuyoshi Ohira
中科院分区：
文献类型：
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作者：
M. Hiraishi;Masaki Yoshida;Hiroyuki Sugai;K. Hoshino;Tsuyoshi Ohira
为了产生汽化燃烧室而不是钎焊，SUS304和黄铜之间的连接处采用激光焊接，因为它现在是通过钎焊制造的，经过许多复杂的工艺。激光焊接的材料为0.6 mm厚的Cu-30%Zn合金（黄铜）和0.5 mm厚的奥氏体不锈钢SUS304。不锈钢与铜锌合金搭接。在0.4 MPa压力下进行了泄漏试验，发现焊缝中存在大量泄漏。通过电子能谱分析和显微观察表明，泄漏是由黄铜的液态金属脆化或不锈钢晶界处的凝固裂纹引起的。裂纹数量随Cu-Zn合金熔体体积的增加而增加，当Cu-Zn合金熔体体积低于SUS304熔体体积的3 %时，裂纹数量较少。因此，为了消除裂纹，仅在焊接后用激光束对不锈钢表面进行重熔。通过消除工艺，使裂纹完全消除；因此，除了在焊珠中出现许多裂纹的焊接条件外，没有发现泄漏。
In order to produce a vaporizing combustion chamber instead of brazing, laser welding was applied to the joint between SUS304 and brass, since it is now fabricated by brazing after many complicated processes.Materials used in the laser welding were 0.6 mm thick Cu-30%Zn alloy (brass) and 0.5 mm thick austenitic stainless steel SUS304. Stainless steel was lap-welded to Cu-Zn alloy.As a result of leak test under 0.4 MPa pressure, many leaks were recognized in the weld bead. The observation by means of EPMA and microscopy indicated that the leaks were caused by cracks which resulted from liquid-metal embrittlement of the brass or solidification cracking at grain boundaries of the stainless steel. The number of the cracks increased with increasing in the volume of melted Cu-Zn alloy, and when the volume was lower than 3 vol.% of the melted SUS304, few cracks occurred. Therefore, to eliminate the cracks by re-melting of only the surface of the stainless steel was conducted with the laser beam after the welding. By the elimination process, the cracks were eliminated completely ; consequently, no leakage was recognized except the welding conditions under which many cracks occurred in the weld beads.