不同焊接方法焊接Ti-22Al-25Nb合金
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摘要
脉冲钨极惰性气体焊接方法、活性剂钨极惰性气体焊接方法和超音频脉冲钨极惰性气体焊接方法分别用于焊接Ti-22Al-25Nb合金。对不同焊接方法获得的焊接接头进行显微组织观察、拉伸性能测试和显微硬度测量。脉冲钨极惰性气体焊接接头的熔合区中柱状晶很少,热影响区中晶界严重过烧;活性剂钨极惰性气体焊接接头完全焊透,在其熔合区的柱状晶是无序排列的;超音频脉冲钨极惰性气体焊接接头的焊缝中心有一小块区域是等轴晶,且在热影响区附近没有明显的晶界过烧现象。通过分析比较观察和测试的结果,发现使用超音频脉冲钨极惰性气体焊接方法获得的焊接接头是最优的,具有最高的抗拉强度和显微硬度。
Ti-22Al-25Nb( at%) alloy was joined using pulse tungsten inert gas welding method,activated tungsten inert gas welding method and ultrasonic pulse frequency tungsten inert gas welding method. The microstructure of the different weld joints was observed, the ultimate tensile strength of them was investigated and the microhardness of them was measured. There were few columnar crystals in fusion zone and was a serious overburning of grain boundaries in the heat affected zone of weld joint using pulse tungsten inert gas welding method. The weld joint using A-TIG welding method was full penetration and the columnar crystals in fusion zone were not in order. There was a small zone of equiaxed crystals in the center of weld seam of weld joint using ultrasonic pulse frequency tungsten inert gas welding method and no obvious overburning of grain boundaries was observed near the heat affected zone. By comparison,it was found that the weld joint using ultrasonic pulse frequency tungsten inert gas welding method had the highest ultimate tensile strength and microhardness.
Ti-22Al-25Nb( at%) alloy was joined using pulse tungsten inert gas welding method,activated tungsten inert gas welding method and ultrasonic pulse frequency tungsten inert gas welding method. The microstructure of the different weld joints was observed, the ultimate tensile strength of them was investigated and the microhardness of them was measured. There were few columnar crystals in fusion zone and was a serious overburning of grain boundaries in the heat affected zone of weld joint using pulse tungsten inert gas welding method. The weld joint using A-TIG welding method was full penetration and the columnar crystals in fusion zone were not in order. There was a small zone of equiaxed crystals in the center of weld seam of weld joint using ultrasonic pulse frequency tungsten inert gas welding method and no obvious overburning of grain boundaries was observed near the heat affected zone. By comparison,it was found that the weld joint using ultrasonic pulse frequency tungsten inert gas welding method had the highest ultimate tensile strength and microhardness.
引文
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