Effect of Preheating Temperature on Microstructure and Mechanical Properties of Aluminium-magnesium Alloy Thick Plate Welded Joint
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摘要: 研究了不同预热温度下5383铝镁合金50 mm厚板焊接接头的力学性能、断口形貌及金相组织。试验结果表明,采用较低的预热温度,虽能实现焊缝的良好成型,内部质量优,但其力学性能偏低。较低的预热温度会导致熔池温度偏低,使母材中大量存在的富FeMn相不能完全熔化而出现偏聚,从而导致焊缝局部塑性和强度变差。Abstract: Mechanical properties, fracture morphology and metallographic structure of 50 mm thick 5383 aluminum-magnesium alloy welded joints with different preheating temperatures were studied. The results showed that although it could be achieved good weld forming and excellent internal quality with lower preheating temperature, the mechanical properties were relatively lower. Analysis results showed that low preheating temperature led to low temperature of welding pool, so lots of FeMn rich phases in aluminum alloy could not melt completely. The remaining FeMn rich phase segregated, which caused the deterioration of local plasticity and strength of welded joints.
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Key words:
- 5383 /
- aluminum alloy /
- plate /
- weld /
- preheating temperature
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