The effect of welding conditions on solidification cracking susceptibility of type 310S stainless steel during laser welding using an in-situ observation technique
The effect of welding conditions on solidification cracking susceptibility of type 310S stainless steel during laser welding using an in-situ observation technique
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DOI：
10.1007/s40194-013-0023-9
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发表时间：
2013-03
影响因子：
2.1
通讯作者：
K. Kadoi;A. Fujinaga;Motomichi Yamamoto;K. Shinozaki
中科院分区：
文献类型：
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作者：
K. Kadoi;A. Fujinaga;Motomichi Yamamoto;K. Shinozaki
凝固裂纹在高焊接速度下容易发生，因此在激光焊接期间更容易发生。凝固行为和热应变变化都依赖于焊接速度，因此，必须测量凝固裂纹的临界应变，以弄清影响凝固裂纹敏感性的因素。然而，在高焊接速度条件下凝固裂纹所需的临界应变尚未确定。研究了焊接速度对310S不锈钢凝固裂纹敏感性的影响。采用高速摄影原位观察技术进行了U型热裂纹试验，定量评价了凝固裂纹的临界应变。凝固裂纹萌生的临界应变随焊接速度的增加而降低。残余液的分布取决于焊接接头的微观组织，随着焊接速度的增加，残余液的形态分布由液滴状向薄膜状转变。残余液相分布形态的转变意味着材料易发生凝固裂纹。
Solidification cracking occurs easily at high welding speeds, and should therefore occur more easily during laser welding. Both the solidification behavior and thermal strain change depend on the welding speed, and therefore, the critical strain for solidification cracking must be measured to clarify the factors influencing the solidification cracking susceptibility. However, the critical strain required for solidification cracking under high welding speed conditions has not yet been determined. The aim of this work was to investigate the effect of welding speed on the solidification cracking susceptibility of Type 310S stainless steel. U-type hot cracking tests were conducted using a developed in-situ observation technique with high-speed camera, and the critical strain for solidification cracking was evaluated quantitatively. The critical strain for solidification crack initiation decreased with increasing welding speed. The distribution of residual liquid depended on the microstructure, and the morphological distribution of the residual liquid changed from a droplet to a thin film with increasing welding speed. The transition in distribution morphology of the residual liquid implies the material is susceptible to solidification cracking.