窄间隙TIG横焊侧壁熔合行为
Investigation on sidewall fusion behavior of horizontal narrow gap TIG
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摘要: 开展了不同焊接工艺参数对窄间隙坡口上下侧壁熔合行为研究。结果表明，钨极位置对下侧壁的熔深影响比较显著，钨极位置在-1.5mm到-2.5mm时，焊缝成形比较稳定。其次是焊接电流对于下侧壁熔深影响较大，基值电流在150~250A时下侧壁熔合良好。送丝速度和脉冲频率对于焊缝表面弯曲程度和夹角α影响较大，送丝速度增加至3000mm/min之后，夹角α接近直角；脉冲频率大于10Hz，焊缝表面弯曲程度变得很小，夹角α接近直角，以上两种情况严重影响下侧壁熔合。钨极位置和电弧电压对上侧壁熔合行为影响比较显著，钨极位置为1。5mm时，上侧壁开始出现咬边现象。送丝速度增加至3000mm/min时，焊缝与上侧壁的夹角开始变小。Abstract: Up and down narrow gap groove was separately studied. The results showed that,dowm sidewall fusion behavior: has the most obviously effects on down sidewall penetration depth, when the position of Tungsten electrode is between -1.5 mm and -2.5 mm, and weld is relatively stable;the welding current also has a greater effect on down sidewall penetration depth,when the base current is between 150 A and 250 A,there is a good fusion, the wire feed speed and pulse frequency have a greater influence on the weld surface bending degree and angle α. When the wire feed speed is increasing to 3 000 mm/min, the angle α is close to the right angle; When the pulse frequency is greater than 10 Hz, the weld surface has a very small degree of curvature,and the angle α is close to the right angle, the above two cases seriously affect the up sidewall fusion.Up sidewall fusion behavior: the position of Tungsten electrode and the arc voltage effects on up sidewall fusion behavior obviously, when arc voltage is 16 V and the position of Tungsten electrode is 1.5 mm,the up sidewall begins to be appearance of undercut. wire feed speed is greater than 3 000 mm/min, bad welds and on the side wall of fusion.
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Keywords:
- narrow gap /
- horizontal position welding /
- sidewall fusion behavior
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[1] 陶祖潜, 隋锡文. ABB公司焊接转子技术[J]. 上海汽轮机, 1990(2): 1-8. Tao Zuqian, Sui Xiwen. Welding rotor technology of ABB company[J]. Shanghai Turbine, 1990(2): 1-8. [2] 中国机械工程学会焊接学会. 焊接手册-材料的焊接(2)[M]. 北京: 机械工业出版社, 2008.
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