| Title |
Research Paper - Surface Treatment : Evaluation of PTA Weld - Overlayers in Low Carbon Steel (Ⅰ) ( Evaluation of PTA Weld - Overlayers Using Taguchi Experimental Method ) |
| Authors |
김형준(Hyung Jun Kim); 권영각(Young Gak Kweon) |
| Abstract |
Taguchi matrix experiments with orthogonal arrays were conducted to evaluate the effects of PTA (Plasma Transferred Arc) process variables on the characteristics of weld-overlayers. The materials investigated were Ni-based Metco 16C and Co-based Stellite 6 powders. The characteristics of PTA weld-overlayers were assessed in terms of surface hardness, dilution, and maximum deposition thickness. Main results are that dilution is decreased as the main arc current is decreased and/or powder feeding rate is increased; surface hardness is increased as the main arc current is decreased; deposition thickness is increased as the powder feeding rate is increased and/or travel speed is decreased. Confirmation runs from the results of Taguchi matrix experiments showed good quality weld-overlayers, but did not exhibit the best quality weld-overlayers. |