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将切割的Q235钢板和SAF2507双相不锈钢板分为4组,采用ZX7-400IGBT逆变式直流弧焊机和A302奥氏体不锈钢焊条进行焊接,并对焊前和焊后板材做微观组织分析及显微硬度分析。研究表明,在焊接电流为90A~130A的条件下,焊接熔合线附近的Q235钢一侧形成了脱碳层,SAF2507双相不锈钢一侧则形成了增碳层;随着焊接电流的增大,热输入也随之增大,焊缝长度变短,焊缝的余高增大,在熔合区的界面处发生碳迁移现象,使接头区域形成显著的硬度梯度。
The cut Q235 steel and SAF2507 duplex stainless steel plate is divided into 4 groups, the use of ZX7-400IGBT inverter DC arc welding machine and A302 austenitic stainless steel electrode for welding, and welded before and after the plate to do the microstructure analysis and Microhardness analysis. The results show that the decarburized layer is formed on the Q235 steel near the weld line and the carbonized layer is formed on the side of SAF2507 duplex stainless steel under the current of 90A ~ 130A. With the increase of welding current, Heat input also increases, the weld length becomes shorter, the weld height increases, the occurrence of carbon migration at the interface fusion zone, the joint region to form a significant hardness gradient.