摘要
利用光纤激光器对DC01镀锌钢板和SUS304奥氏体不锈钢薄板进行了激光非熔透搭接焊实验、反变形焊接实验,测得了SUS304钢板(下板)表面微凸起的变形量和变形轮廓,研究了非熔透焊后SUS304钢板表面微凸起变形产生的机理。研究结果表明:角变形是SUS304钢板表面微凸起产生的重要原因;通过反变形法矫正角变形可降低微凸起的最大高度,但微凸起区域的塑性凸起变形仍存在;焊接过程中的角变形和热膨胀引起的塑性变形是非熔透搭接焊下SUS304不锈钢板无焊缝一侧微凸起变形的主要原因。
Partial penetration laser welding experiment of DC01 galvanized steel plate and SUS304 austenite stainless steel as well as pre-deformation experiment are conducted by fiber laser. The deflection and deformation profile of SUS304 steel plate(lower plate) are measured and the mechanism of the micro bulging distortion of SUS304 steel plate surface after partial penetration laser welding. The results show that angular distortion is an important reason that lead to the micro bulging distortion of austenite stainless steel surface. Pre-deformation can decrease the maximum deformation height significantly. However, the plastic bulging distortion still occurs in micro bulging distortion area. It is concluded that the main reason of micro bulging distortion of SUS304 steel plate at weldless side in partial penetration laser welding is the combination of angular distortion and plastic deformation caused by thermal expansion during welding.
引文
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