The microstructure and mechanical properties of Q235/316L dissimilar steel welding joints were researched by using metallurgical microscope,universal testing machine,impact test enginery,microhardness tester etc.The results showed that microstructure and mechanical properties of dissimilar steel welded joints were improved in the process of Q235/316L dissimilar steel welding,while the A042 was used as a surfacing welding material and the A022 was used as a fill welding material.The performance dissimilar steel welded joints of 300℃ × 2h insulation and air-cooled aging treatment was superior to that of 500℃ × 2h,700℃ × 2h insulation,air-cooled aging treatment and non-aging treatment.It was caused by existence ferrite and pearlite,so,yield strength and tensile strength were greatly improved.At the same time,weld zone and 316L HAZ impact toughness were increased,due to the elimination of hydrogen and reverse change austenite amount of growth.%采用金相显微镜、万能试验机、冲击试验机、显微硬度计等对Q235/316L异种钢焊接接头的显微结构和力学性能进行研究.结果表明:在Q235/316L异种钢焊接中,以A042作为堆焊焊材,A022作为填充焊材,可使异种钢焊接接头的组织和力学性能得到提高;经300℃×2h保温,空冷时效处理后的异种钢焊接接头的综合性能优于500℃×2h,700℃×2h保温,空冷时效处理及不进行时效处理的异种钢焊接接头.这是由于铁素体、珠光体的存在使其屈服强度和抗拉强度得到了较大提高,同时,氢的消除及逆转变奥氏体数量的增加也使焊缝区和316L HAZ冲击韧性有所提高.
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