采用国产6005A铝合金进行焊接试验，并对焊接接头进行了力学性能检测及金相显微组织观察。结果表明，6005A铝合金的焊接接头焊缝两侧离焊缝中心约10～15mm的地方存在一对对称分布的软化区，其原因是由于焊接热的影响使该部位发生了过时效.对进口的6005A大型多孔铝型材焊接接头进行分析，发现焊接接头上软化区硬度降低的程度明显较小，这是由于实际的多孔型材在该部位设置有加强筋，加强筋有显著的散热作用，降低了焊接过程中该部位的温升.另一方面，加强筋增大了软化区的承载面积，有机械补强作用。%Welding test of extruded 6005A Aluminium alloy was performed and mechanical properties and optical microstructures were studied. The results show that there is a pair of symmetric soft zone which was located on both sides of the weld about 10～15 mm apart from the weld center. The occurrence of soft zone is due to overaging caused by heat input during welding. In the condition of big practical extruded 6005A alloy welded joint, the softing degree of mentioned above soft zone obviously decreases, attributed to that there is a reinforce rib which have obvious heat scatting action, and then decreases the temperature increasing during welding. On another hand, this reinforce rib increase the loading area and have a strength compensating.
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