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董红刚, 胡文金, 段玉平, 王旭东. Si和Cu元素对铝-镀锌钢GTAW接头性能的影响[J]. 焊接学报, 2010, (11): 9-12.
引用本文: 董红刚, 胡文金, 段玉平, 王旭东. Si和Cu元素对铝-镀锌钢GTAW接头性能的影响[J]. 焊接学报, 2010, (11): 9-12.
DONG Honggang, HU Wenjin, DUAN Yuping, WANG Xudong. Effects of Si and Cu additions on properties of dissimilar aluminum-galvanized steel weld[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (11): 9-12.
Citation: DONG Honggang, HU Wenjin, DUAN Yuping, WANG Xudong. Effects of Si and Cu additions on properties of dissimilar aluminum-galvanized steel weld[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (11): 9-12.

Si和Cu元素对铝-镀锌钢GTAW接头性能的影响

Effects of Si and Cu additions on properties of dissimilar aluminum-galvanized steel weld

  • 摘要: 通过填加4种不同的焊丝,在焊缝中加入不同含量的Si,Cu元素,进行了5A02铝合金和镀锌钢板之间异种金属的钨极氩弧焊(GTAW)搭接试验.试验发现Cu元素含量高于一定值时,金属间化合物层厚度大于10μm,而当Cu元素含量较低时,随着Si元素加入量的增加,金属间化合物层的厚度减小,最小约为2μm.当Si元素含量大于5%时,抗拉强度接近136 MPa.但此时,制约焊缝性能的主要因素是焊缝根部出现的气孔聚集缺陷.另外,Si元素的加入还可以改善焊缝与铝合金母材连接处柱状晶区的组织.

     

    Abstract: Dissimilar metals of 5A02 aluminum alloy and galvanized steel were joined with lap joint by gas tungsten arc welding(GTAW) with four filler wires,respectively.The different contents of Si and Cu were added into the weld through different filler metals.It is found that when the Cu content exceeding a certain amount,the intermetallic compounds(IMCs) layer is thicker than 10 μm.When the Cu content is low,the thickness of the IMCs layer decreases with the increase of Si content in the weld.The IMCs layer can be controlled as thin as about 2 μm.Measurements showed that the tensile strength of the aluminum-galvanized steel weld can reach 136 MPa when the Si content is more than 5%,and it is thought that the pores are the main factor to affect the properties of the joint.In addition,more Si addition from the filler metal can improve the microstructure in the zone where the weld and base metal of aluminum alloy joined.

     

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