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LD10、147高强铝合金用NaOH+HNO_2进行表面处理会导致铝合金表面塑性变形层吸氢和形成含水合物的不规则氧化膜,这种不规则氧化膜对焊缝气孔的产生有很大影响;研究证明,对焊缝接合面进行干铣是减少或消除焊接气孔的最佳焊前准备方法;用釲筛测氢仪对不同状态的焊缝接合面的测试表明,对焊缝接合面的任何触摸污染都可造成焊接气孔。方波交流等离子弧焊、高频脉冲TIG焊和交流方波TIG焊均对消除和控制焊接气孔有明显效果。
The surface treatment of LD10,147 high-strength aluminum alloy with NaOH + HNO_2 can lead to hydrogen absorption and formation of hydrate-containing irregular oxide film on the plastic deformation layer of aluminum alloy. Such irregular oxide film has a great influence on the porosity of weld The research shows that the dry-milling of the weld joint surface is the best way to reduce or eliminate the welding porosity. The test of the weld joint with different states by the sieve hydrogen tester shows that, Any touch of pollution can cause weld porosity. Square wave AC plasma arc welding, high frequency pulsed TIG welding and alternating current square wave TIG welding have obvious effects on eliminating and controlling welding porosity.