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本文通过模拟技术及直接试验方法对汽车后桥40(2r(40MnB)调质钢轴套与16Mn桥壳的Ar+CO_2混合气体保护焊工艺进行了研究。焊接接头设计中,除了考虑抗疲劳性能外,还尽可能地降低了拘束度,以免产生裂纹。焊接参数的选择采用了分因素模式试验法。经过光学显微镜、电子显微镜检验和显微硬度的测定。确认在热影响区并不存在马氏体淬硬组织。接头的疲劳强度、冲击韧性、冷弯和拉伸性能试验表明:采用混合气体保护焊工艺后,有可能免去预热及焊后热处理,直接用于汽车后桥的焊接生产。该项工艺已在交通部扬州汽车修配厂进行试生产。
In this paper, Ar + CO_2 hybrid gas shielded arc welding process of 40 (2M (40MnB) quenched and tempered steel bushing and 16Mn axle housing of automobile rear axle is studied by means of simulation technology and direct test method.In the design of welding joint, In addition, as much as possible to reduce the degree of restraint, so as to avoid cracks.Selection of welding parameters using the sub-factor test method.After optical microscopy, electron microscopy and microhardness test to determine the heat-affected zone does not exist in the horse Fatigue hardenability, impact toughness, cold bending and tensile properties of the joints were tested: it is possible to eliminate the need for preheating and post-weld heat treatment, Production. The process has been in the Ministry of Communications Yangzhou Auto Repair Factory for trial production.