Q370qE-HPS与正火Q370qE焊接性能探讨

Discussion on welding performance of Q370qE-HPS and normalized Q370qE

利用手工弧焊机、气体保护焊机、维氏硬度计、冲击试验机、金相显微镜等对不同厚度高性能桥梁钢Q370qE-HPS和普通正火桥梁钢Q370qE的焊接热影响区最高硬度、斜Y坡口焊接裂纹敏感性、不同温度下对接接头冲击功以及焊接接头-40℃冲击功分别进行了对比分析,结果表明,Q370qE-HPS比普通正火Q370qE有较低的淬硬倾向,在焊接裂纹敏感性方面无明显差异,有更好的冲击性能。较低的含碳量以及更加细小均匀的组织是Q370qE-HPS比普通正火Q370qE焊接性能优异的主要原因。

The maximum hardness at welding heat-affected zone（HAZ）,the welding crack susceptibility at oblique Y groove,the impact energy of the butt joint at different temperatures and the soldered joints at-40 ℃ of the high performance bridge steel Q370 qE-HPS and the normalized bridge steel Q370 qE with different thickness were compared and analyzed by using manual arc welding machine,gas shielded welding machine,Vickers hardness,impact testing machine and metallographic microscope. The results showed that compared with the normalized bridge steel Q370 qE,the Q370 qEHPS had lower harden quenching tendency and better impact property,but there was no difference between the welding crack susceptibility of the two kinds of steel. The lower carbon content and the more fine and homogeneous tissue in Q370 qE-HPS steel caused the better welding performance than that of the normalized bridge steel Q370 qE.