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采用富氩气体保护焊方法,分别匹配ER50-6和MK·G60-1实芯焊丝对50°、60°、70°三种不同坡口角度的Q550钢板进行对接焊,并对其焊接接头的金相组织进行了观察分析,对接头拉伸、冲击等力学性能进行了检验。结果表明,ER50-6焊缝组织为AF+PF+FSP;MK·G60-1焊缝组织为AF+PF,其中铁素体含量明显少于ER50-6焊缝,针状铁素体也明显细化且含量明显增多。ER50-6焊丝所得接头拉伸试验全部断裂于焊缝,随着坡口角度的加大,焊缝强度先增加,后大幅降低,断后伸长率逐渐降低,接头三区的冲击功均是先升高后降低。随着坡口角度的增加,MK·G60-1焊丝所得焊接接头拉伸强度逐渐下降,断后伸长率呈逐渐增加的趋势,焊缝及HAZ冲击功均是先降低后升高,熔合区的冲击功则是逐渐升高,接头拉伸、冲击等力学性能明显优于使用ER50-6焊丝。
Adopt argon-rich gas shielded welding method to match ER50-6 and MK · G60-1 solid wire respectively to butt weld Q550 steel plates with different bevel angles of 50 °, 60 ° and 70 °, Metallography was observed and analyzed, the joint tensile, impact and other mechanical properties were tested. The results show that the weld microstructure of ER50-6 is AF + PF + FSP; the weld microstructure of MK · G60-1 is AF + PF, in which the content of ferrite is obviously less than that of ER50-6 and the acicular ferrite is obviously Refine and significantly increased content. Tensile test of ER50-6 welding wire all broke in the weld seam. With the increase of groove angle, the weld seam strength first increased and then decreased sharply, and the elongation after fracture decreased gradually. The impact energy of the three joints in the joint was first Increase and decrease. With the increase of bevel angle, the tensile strength of welded joints obtained by MK · G60-1 wire gradually decreased, the elongation at break increased gradually, and the weld and HAZ impact energy first decreased and then increased. Impact energy is gradually increased, tensile joint, impact and other mechanical properties significantly better than the use of ER50-6 wire.