The results reveal that the grain size of welding seam decreases with the increase of welding velocity and the rate of tubes' extension increases under the same technological conditions.
经对试验结果分析表明：在其它工艺参数不变的情况下，随着焊接速度的增加，焊缝组织的晶粒度减小。铜管的扩口率增加。
The results reveal that the grain size of welding seam decreases with the increase of welding velocity and the rate of tubes' extension increases under the same technological conditions.
经对试验结果分析表明：在其它工艺参数不变的情况下，随着焊接速度的增加，焊缝组织的晶粒度减小。铜管的扩口率增加。
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