Influence of Interwire Distance and Arc Length on Welding Process and Defect Formation Mechanism in Double-Wire Pulsed Narrow-Gap Gas Metal Arc Welding
Source abstract
Abstract
The effects of interwire distance (d) and arc length correction coefficient (Cc) on the arc behaviors, droplet transfer and welding process stability in the double-wire narrow-gap gas metal arc welding (NG-GMAW) were investigated. With d changing from 10mm to 20mm, the arc deflection only occurs at the background stage of pulsed welding current, and the droplet transfer mode keeps unchanged. A large Cc (20%) leads to serious peak arc deflection and unstable droplet transfer, whereas a small Cc (− 10%) eliminates the arc deflection and brings about short-circuiting droplet transfer. The arc interruption frequently occurs when d is 20mm or Cc is 20%. Moreover, when d is 10mm or Cc is 20%, serious sidewall arcs occur in double-wire NG-GMAW. With the increase in d and/or decrease in Cc, the welding process stability can be improved at first and then gets worse. In general, the trailing arc is more stable than the leading arc. Increasing Cc will result in a serious surface depression defect on the left side of the weld bead because of the serious peak arc deflection. A sound weld bead is obtained when the interwire distance is 15mm.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Welding Techniques and Residual Stresses · Vacuum and Plasma Arcs · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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