Fusion Joining of Aluminium to Mild Steel With and Without Copper Filler Metal
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概要
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The joining mechanism of aluminium to mild steel using copper filler metal under plasma arc and the joining reaction of aluminium to mild steel without filler metal under high current pulsed TIG arc have been investigated. In plasma arc welding, using copper filler metal, a convection and a convection swirl are produced in melted zone instead of the formation of intermetallic compound of iron and aluminium. On the upper side of arc melted region which is directly beneath the plasma arc, a uniform structure is observed, resulting in composite region, and at the solid/liquid interface of this upper side, an irregular boundary is recognised. On the lower side of the melted region, a convective flow exists, resulting in the formation of an incomplete mixed region. In pulsed TIG arc welding of mild steel and aluminium without filler metal, ζ-phase and η-phase are predominantly formed at the interface. The difference of this kind in the intermetallic compound formed may cause a compositional variation in the enlargement of melt width under the plused TIG arc.
- 社団法人溶接学会の論文
- 1988-04-01