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采用高频感应钎焊的方法,研究了E02NC,SUPER5A,E22NC 3种Zn-Al系药芯焊丝焊接薄壁Al/Al,Cu/Al管的界面微观组织。结果表明:Al/Al管3种焊料焊接界面中微观组织主要都由锌、铝固溶体组成,但E02NC焊后存在气孔,E22NC焊后缺陷较多。而Cu/Al管则不同,E02NC焊缝界面由锌、铝固溶体、锌铜化合物、铜铝锌化合物组成,但焊后存在气孔,界面中存在大量三元金属间化合物。SUPER5A界面由锌、铝固溶体、铜铝化合物组成,界面中只在铜一侧生成少量化合物,焊后缺陷相对较少。E22NC由于在铜一侧润湿较差的原因,不适合应用在薄壁铜/铝管高频感应焊中。
The interfacial microstructures of thin-walled Al / Al and Cu / Al tubes welded by three kinds of Zn-Al flux cored wire were studied by high-frequency induction brazing method with E02NC, SUPER5A and E22NC. The results show that the microstructures of the three kinds of Al / Al tubes are mainly composed of zinc and aluminum solid solution. However, there are pores after E02NC welding and there are many defects after E22NC welding. The Cu / Al tube is different, E02NC weld interface by the zinc, aluminum solid solution, zinc and copper compounds, copper and aluminum zinc compounds, but there are pores after welding, the interface there is a large amount of ternary intermetallic compounds. SUPER5A interface by the zinc, aluminum solid solution, composed of copper and aluminum compounds, only a small amount of compounds generated in the copper side of the interface, the relatively few defects after welding. E22NC is not suitable for high frequency induction welding of thin-walled copper / aluminum tubes due to poor wetting on the copper side.