SUS304不锈钢窄间隙激光填丝焊性能  

Performance of Narrow Gap Laser Welding with Filling Wire for SUS304Stainless Steel

作　　者：徐国建[1] 钟立明[1] 杭争翔[1] 李挺[1] 邢飞 石磊[3] 唱丽丽 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]鞍山煜宸科技有限公司,辽宁鞍山114044 [3]沈阳新松机器人自动化股份有限公司激光技术事业部,辽宁沈阳110168

出　　处：《中国激光》2013年第10期77-82,共6页Chinese Journal of Lasers

基　　金：辽宁省自然科学基金(20092047)

摘　　要：采用窄间隙全固态光纤激光填充热丝焊接方法取代了以往的窄间隙非熔化极气体保护焊(TIG)填充热丝焊接方法,焊接板厚为20mm、材质为SUS304奥氏体不锈钢。初步确定适合于窄间隙激光填充热丝焊接的坡口形式和焊接工艺参数;通过试验,研究分析焊缝金属组织中气孔和结晶裂纹产生的原因;调整工艺参数,在优化后的最佳工艺参数下,获得了热影响区域小、表面成形性好、无焊接缺陷的焊接接头;焊缝金属为细小的奥氏体柱状晶,与母材形成良好的连接;焊接变形小,满足了焊接变形要求;焊缝金属的显微硬度略高于母材,拉伸性能和弯曲性能均满足试验要求,获得了力学性能良好的焊接接头。The narrow-gap solid fiber laser welding with filling hot wire replaces the previous narrow gap tungsten inert gas （TIG） welding. The thickness of the welding is 20 mm and the material is SUS304 austenitic stainless steel. Preliminary study shows that the groove form and the welding process parameters are suitable for narrow gap laser welding with filling hot wire. The causes of blowhole and crystallization crack in the weld metal are analyzed through experiments and the process parameters are adjusted. Under the optimum process parameters, smaller heat affected zone, better surface formability are obtained, and there is no welding defects in the welded joints. The weld metal is fine austenite columnar crystals, which forms a good connection with the base material. Welding deformation is small enough to satisfy the requirement. The weld metal is slightly micro harder than the base metal. The tensile and bending properties meet the test requirements, obtaining good mechanical properties of the welded joints.

关 键 词：激光技术 厚板奥氏体不锈钢 光纤激光填丝焊接 气孔 结晶裂纹 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]