JWJ > Volume 32(6); 2014 > Article
Journal of Welding and Joining 2014 December;32(6) :571-576.
Published online December 31, 2014.
Evaluation of Gas Metal Arc Welding Characteristics according to Contact Tip Materials
Dong Yoon Kim*, In Sung Hwang*, Dong Cheol Kim*, Moon Jin Kang*
*Welding & Joining R&BD Group, KITECH, Incheon 406-840, Korea
Correspondence: In Sung Hwang  Email: hisman@kitech.re.kr
  Published online December 31, 2014
ABSTRACT
The contact tip for gas metal arc welding has important functions to transmit the welding current to the wire and to guide the wire to molten pool. If the contact tip is damaged, it is a cause of lowering the welding productivity due to removal of welding defects and replacement of contact tip. In case of the use of a contact tip for a long time the arc is unstable because the processed hole in the contact tip center is larger, and the variation of aiming position of the welding wire causes a seam tracking error.
In this study, gas metal arc welding experiments using contact tip of three different materials were performed. The contact tips with Cu-P, Cu-Cr, and Cu-ODS were used at the experiments, and the welding characteristics by each contact tip were evaluated. After welding contact tip appearance, welding spatter adhesion amount of the nozzle, and weld bead appearance were evaluated. The welding current and welding voltage were measured to verify arc stability during arc welding.
Keywords: Gas metal arc welding | Contact tip | Solid wire | Wear resistance | Spatter | Welding current | Welding voltage | Arc stability
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