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采用金相观察、透射电镜分析和焊接热模拟技术，研究了含Ｎｂ，ＮｂＴｉ，ＮｂＴｉＢ的微合金控轧控冷钢的焊接性能、热影响区组织及冷裂纹敏感性，讨论了微合金元素对焊接性能的影响·试验结果表明，厚规格汽车桥壳钢的热影响区没有出现马氏体组织，微合金元素Ｎｂ，Ｔｉ，Ｂ的加入提高了热影响区性能·在ｔｍ＝１３００℃，τ８／５＝３０ｓ时的焊接热模拟组织与实际焊接组织相一致·试钢在冷裂试验中并没有冷裂纹产生，可得出结论：厚规格桥壳钢的焊接性能较好·
The micro-alloyed controlled rolling controlled cold rolled steel containing Nb, NbTi and NbTiB was investigated for its welding performance, microstructure and cold crack susceptibility in the heat affected zone by metallographic observation, transmission electron microscopy and thermal simulation. The effects of microalloying elements on Effect of welding performance · The test results show that the martensitic structure does not appear in the heat affected zone of the thick gauge automobile axle shell steels and the addition of microalloying elements Nb, Ti and B improves the HAZ performance. At tm = 1300 ℃, τ8 / 5 = 30s when the welding heat simulation of the organization and the actual welding organization · Test steel in the cold cracking test and no cold cracks can be concluded that: Thickness of the shell of the steel welding performance is better ·