激光焊接316LN平板对接焊试验中气孔成因初探
Pore formation in laser butt welding of 316LN
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摘要: 在激光自熔焊接5 mm厚316LN平板对接焊系列试验时,产生了气孔. 为探讨气孔成因,在试验中先后改变了保护气体流量、保护气体种类及被焊母材,同时焊后借助扫描电镜、光学显微镜、X射线能谱以及对母材进行化学成分分析等手段对试验结果进行分析. 结果表明,焊缝中气孔呈圆形,气孔形成中常伴随着夹杂物,以氢气孔为主. 其中1号材料焊接时焊缝是先以δ结晶模式,而这种结晶模式导致气孔敏感性较大,其显微金相组织也证实存在δ相,氩气不纯也是气孔成因之一.Abstract: The porosities were observed in laser penetration welding of 5 mm thick 316LN plat with butt joint. In order to investigate the porosity formation, the shielding gas flow, shielding gas type and base metal had been changed in the experiments. As well as the experimental results were analyzed by means of SEM, LM, X-ray, WEDM and analysis of chemical component of base metal. The results showed that the porosities in the weld are round and often accompanied by inclusions, and they are mainly hydrogen porosity. And for the chemical compositions of the No.1 material, the δ crystallization mode has higher susceptivity of porosity. It was confirmed that the δ phase appeared in the metallographic microstructure. In addition, impurity argon is another important factor for the porosity formation.
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