大口径Cu/Al合金薄壁管的感应加热焊接工艺探究

Research on induction heating welding process of large diameter Cu/Al alloy thin wall tube

运用感应加热方法,研究了一种操作性强工艺简便的大口径薄壁合金铝连接铜管的焊接方法,研究了焊接电流、焊缝长度、焊接高温保温时间对大口径薄壁铜铝合金管的影响,采用ZWICK-2050电子万能材料试验机测试界面结合强度,用扫描电子显微镜(SEM)和偏光显微镜(PM)观察界面形貌,EDX和X射线衍射仪(XRD)进行物相分析。通过感应加热可以实现铜铝薄壁管的焊接,当加热时间6 s时,焊缝长度为15 mm时,铜铝焊接管的质量最佳,焊接结合强度最高。铜铝中间化合物层只有Al2Cu和AlCu两种,没有发现Al4Cu9类型的化合物。

Using induction heating method, in this paper, a kind of operational and uncomplicated process was explored, by which large diameter thin-walled aluminum alloy and copper pipe could be welded. The effect of welding current, welding-length and welding high temperature insulation time on large diameter thin-walled copper aluminum tubes was studied. The microstructures of the interface were observed by scanning electron microscope(SEM) and polarizing microscope(PM), and the interfacial reaction products were analyzed by X-ray diffraction(XRD) and energy dispersive X-ray spectroscopy(EDX). When the heating time was 6 s and weld length was 15 mm, the quality of copper aluminum welded pipe was the best, and the tensile strength was highest. The copper-aluminum intermediate compounds layer were only Al2Cu and AlCu, and no Al4Cu9-type compounds had been found.