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采用微型储能焊机对厚度为0.4mm的LF2铝合金薄板进行快速凝固点焊,研究分析了接头组织形貌和形成机理。结果表明,储能焊能够实现LF2铝合金薄板的快速凝固焊接,焊接接头由熔核区、熔合区和热影响区组成。极大的冷却速率使得接头组织瞬间形核并快速生长,形成组织细小致密具有快速凝固特征的焊接接头。焊接裂纹是LF2铝合金储能焊主要焊接缺陷。对焊接裂纹机理分析发现,铝合金线膨胀大导致焊接应力产生是形成焊接裂纹的主要原因。
A miniature energy storage welding machine was used to rapidly solidify the spot welding on the LF2 aluminum alloy sheet with a thickness of 0.4mm. The morphology and formation mechanism of the joint were studied and analyzed. The results show that the energy storage welding can realize rapid solidification welding of LF2 aluminum alloy sheet. The welded joint consists of nugget zone, fusion zone and heat affected zone. The great cooling rate makes the joint tissue instant nucleation and rapid growth, the formation of small and dense tissue with rapid solidification characteristics of the welded joints. Welding cracks are the main welding defects of LF2 aluminum alloy welding. The analysis of welding crack mechanism found that the large stress caused by the expansion of aluminum alloy wire is the main reason for the formation of welding cracks.