Patent ID: 9321119
Filing Date: 2016-04-26
CPC Classification: B23K

Claim Text:
1. A combination welding method of performing gas metal arc welding on a butted portion between steel plates and performing submerged-arc welding behind the gas metal arc welding, the method comprising: welding a back side of the butted portion; welding a finishing side of the butted portion by gas metal arc welding, the gas metal arc welding step using: welding the finishing side by submerged-arc welding behind the gas metal arc welding of the finishing side such that a distance between a last electrode of the gas metal arc welding and a first electrode of the submerged-arc welding is from 40 to 100 mm, and such that the submerged-arc welding is conducted before a melted metal of the gas metal arc welding is completely solidified, wherein the heat of the gas metal arc welding is deeply input in the thickness direction of a steel plate, the heat of the submerged-arc welding is input to a surface layer side thereof, and an upside of weld metal formed by the gas metal arc welding is melted again by the submerged-arc welding.