论文部分内容阅读
本文通过几种焊接方法的工艺因素试验,用热塑性试验和焊接热模拟试验等方法,用光镜、电镜、能谱、电子探针等显微分析手段,探讨了ZGMn13钢焊接热影响区(HAZ)裂纹的性质、形成机理和影响因素。结果表明:ZGMn13钢HAZ 裂纹为液化裂纹及其扩展的结果。这种液化裂纹主要是由于P、S 等杂质元素所形成的低熔点相、非金属夹杂物和碳化物导致晶界液化或弱化,在较大的焊接应力作用下形成的。采用小线能是CO_2气体保护焊能明显减少ZGMn13钢HAZ 的液化裂纹倾向。
In this paper, the welding heat affected zone (HAZ) of ZGMn13 steel was studied by means of technological factors test of several welding methods, microscopic analysis methods such as thermography test and welding thermal simulation test with light microscope, electron microscope, energy spectrum and electron probe. ) The nature of the crack, formation mechanism and influencing factors. The results show that the HAZ crack of ZGMn13 steel is the result of liquefaction crack and its propagation. This liquefied crack is mainly due to the low melting point phase formed by P, S and other impurity elements, and the non-metallic inclusions and carbides cause the grain boundaries to liquefy or weaken, which are formed under the effect of larger welding stress. The use of small wire energy is CO_2 gas shielded welding can significantly reduce the tendency of ZGMn13 steel HAZ liquefaction cracking.