铝板交流TIG焊阴极点清洗作用的实验观察

S. Tashiro, H. Sawato, Manabu Tanaka
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引用次数: 13

摘要

由于铝板电弧焊要实现高质量焊缝,必须清除铝表面氧化层,因此一般采用交流TIG焊。在交流TIG焊的EP(极正)阶段,通过阴极点的清洗作用去除氧化层。本文报道了用高速摄像机对铝板交流TIG焊中阴极点对氧化层清洗作用的实验观察结果。结果表明,阴极斑点在氧化层上的移动速度较慢,平均速度为26.1m/s。另一方面,靠近熔池中心的阴极斑点移动速度较快,其平均速度达到121.9 m/s,氧化层已被大部分去除。此外,速度随阴极点位置的变化而变化很大,最大速度超过1 km/s。
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Experimental observation of cleaning action of cathode spots in AC TIG welding of aluminum plates
Since it is indispensable to remove oxide layer on aluminum for realizing high quality weld joint in arc welding of aluminum plates, AC TIG welding is generally employed. In periods of EP (Electrode Positive) of AC TIG welding, the oxide layer is removed by cleaning action of cathode spots. In this paper, results on experimental observations of the cleaning action of the oxide layer by cathode spots in AC TIG welding of the aluminum plate with a high speed video camera will be reported. As a result, it was found that cathode spots moved slowly on the oxide layer and their averaged velocity was 26.1m/s. On the other hand, cathode spots near the center of the weld pool, where the oxide layer had been mostly removed, moved at high speed and their averaged velocity reached 121.9 m/s. Furthermore, the velocity greatly changed depending on the position of the cathode spot and exceeded 1 km/s at the maximum.
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