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采用热电偶测温技术测量了激光-MAG复合焊及常规MAG焊接头粗晶区热循环曲线,并通过金相显微镜对比分析了两种焊接接头粗晶区组织特征。研究结果表明:与常规MAG焊相比,HLAW热循环加热及冷却速度较大,高温停留时间短,呈陡升陡降特征;粗晶区主要由粒状贝氏体、贝氏体、贝氏体基体上析出粒状碳化物组织及细小板条状马氏体组成;M-A岛含量较少,以细小颗粒状弥散分布在铁素体基体上。
Thermocouple temperature measurement technique was used to measure the thermal cycling curve of the coarse-grained region of the laser-MAG composite welding and conventional MAG welding. The microstructure characteristics of the two kinds of welded joints were compared by metallographic microscope. The results show that compared with the conventional MAG welding, the heating and cooling rates of the HLAW thermal cycle are large, the residence time at high temperature is short, and the characteristics are steep and steep. The coarse grains mainly consist of granular bainite, bainite and bainite On the matrix, granular carbide and fine lath martensite are precipitated. The content of MA island is less and disperses in fine granular form on the ferrite matrix.