Study of the mechanism of spatter produced by basic welding electrodes
- Ames Lab., IA (United States)
- Gansu Univ. of Technology, Lanzhou, Gansu (China)
In this work a device was made to control the current at three stages of short circuiting welding: at the beginning of short circuiting, during the overall period of short circuiting, including the breaking stage, and at the arc reinitiating stage. By investigating the effects of these currents on the spatter produced by basic welding electrodes, the decisive parameter which determined spatter quantities was identified as the current at the short circuit breaking stage. On the basis of the experimental results from the combined effect of short circuiting current and the oxygen potential in the covering, it was found that the major process causing spatter was the explosion of CO gas bubbles, which resulted in the breakage of the short circuiting bridge. The high density of current intensified this explosion and increased the spatter quantity. The spatter mechanism caused by the explosion of gases was identified by studying the metal transfer using laser back-light, high-speed photography and x-ray, high-speed photography to record two images simultaneously, along with arc sound and arc voltage oscillographs.
- OSTI ID:
- 413342
- Journal Information:
- Welding Journal, Journal Name: Welding Journal Journal Issue: 10 Vol. 75; ISSN 0043-2296; ISSN WEJUA3
- Country of Publication:
- United States
- Language:
- English
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