Straightening device for welding wire

A straightening device for a welding wire, comprising:

• two sets of roll groups, each including a plurality of straightening rolls configured to allow the welding wire to pass through the two sets of roll groups and to straighten bends of the welding wire,
• the plurality of straightening rolls of the two sets of roll groups being arranged at a predetermined arrangement interval along a straightening path along which the welding wire passes,
• the plurality of straightening rolls of the first set of roll groups being arranged so that a first portion of said plurality is disposed on a first side of the straightening path and a second portion of said plurality is disposed on a second side of the straightening path, an axial center of two adjacent straightening rolls of said first portion being separated by a distance that is twice the predetermined arrangement interval, and an axial center of two adjacent straightening rolls of said second portion being separated by said distance,
• the plurality of straightening rolls of the second set of roll groups being arranged so that a first portion of said plurality is disposed on a third side of the straightening path and a second portion of said plurality is disposed on a fourth side of the straightening path, an axial center of two adjacent straightening rolls of said first portion being separated by said distance and an axial center of two adjacent straightening rolls of said second portion being separated by said distance,
• the first side, the second side, the third side, and the fourth side being different,
• the plurality of straightening rolls of the first set of roll groups and the plurality of straightening rolls of the second set of roll groups engage the welding wire according to:
• -
• 1.3
• ≤
• δ
• d
• ≤
• 0.3
• ,
• where
• δ is an amount of overlap between straightening rolls on the first side and the second side, and between straightening rolls on the third side and the fourth side, when viewed along a direction of the straightening path, and
• d is a diameter of the welding wire.