| 摘要 |
PURPOSE: A butt joint GMA(Gas Metal Arc) root pass welding method is provided to reduce root gap variations and form stable back beads as well through relative arc force. CONSTITUTION: In a butt joint GMA root pass welding method, the relative arc force is raised by increasing current and welding speed when a root gap decreases while the relative arc force is lowered when the root gap increases. When the root gap decreases, the weld cross section is reduced to prevent shortage of weld penetration caused by increase in current and welding speed.
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