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本文针对变形铝合金复合材料的运输车冷凝器的钎焊,制作了与实际产品一样的产品模拟件,并在模拟试验装置上进行了失效试验,断裂发生在管与支架焊接交界处,裂纹源起始于焊缝根部,冷凝器管支架焊缝虽然存在有焊接空洞,但不是引起失效的原因所在;冷凝器外壁组织为α基体+(α+Si)共晶体,共晶体以网状形式分布于α基体上,脆化了材料的晶界。失效试验表明,焊接接头处能够满足实际工况下的工作要求。为了进一步提高产品质量,实际产品中增加了去应力处理,以降低应力腐蚀失效的可能性。
In this paper, aiming at the brazing of the transporter condenser of the deformed aluminum alloy composite, the same product simulation part as the actual product was made and the failure test was conducted on the simulation test device. The fracture occurred at the welding junction of the pipe and the support, Starting from the root of the weld, although there is a welding hole in the weld pipe of the condenser tube support, it is not the cause of failure. The outer wall of the condenser is composed of α matrix + (α + Si) eutectoid and the eutectics are distributed in the form of mesh On the α matrix, embrittlement of the material grain boundaries. Failure tests show that the welding joints to meet the actual conditions of work requirements. In order to further improve product quality, the actual product added to the stress treatment to reduce the possibility of stress corrosion failure.