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Plasma 분체육성용접법 (粉體肉盛熔接法) 에 의한 Al 합금의 표면후막 경화기술 개발
홍태환,문정훈,서창제,중전일박,송전복구 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.12
A new Plasma Transferred Arc(PTA) hardfacing process has been developed to obtain an overlay weld metal having excellent wear resistance. Effect of Ti, Ni and Cu metal powders addition on the surface characteristics of Aluminum alloy 5083 has been investigated with PTA process. Optimum overlaying condtions under which bead appearance is superior and porosities in overlaid metal are lesser are determined. This paper describes the results of tests on the performance of the overlay weld metal. The results are as fallow: (1) The mean hardness of the overlay weld metal is adjustable from Hv200 to Hv600 by PTA process. (2) Concerning defect of overlaid metals, blow holes were seen in Ni and Ti addition. Residual gas contents in blow hole for overlaid metals were confirmed as mainly H₂and a little of N₂. (3) The welding performance of this process is improved by use of DCRP plasma arc, which performs cleaning action on the base metal and weld metal. These results is an increase in welding efficiency. (4) The results of wear tests show that the weld metal has high wear resistance by the PTA process.
플라즈마분체 오버레이법에 의한 알루미늄합금 표면의 경화특성에 관한 연구(I) -후막 표면 합금화층의 형성조건과 그 조직-
이규천,강원석,이영호,中田一博,松田福久 대한용접접합학회 1994 대한용접·접합학회지 Vol.12 No.4
Effect of Cr, Cu and Ni metal powders addition on the alloyed layer of aluminum alloy (AC2B) has been investigated with the plasma transferred arc (PTA) overlaying process. The overlaying conditions were 125-200A in plasma arc current, 150mm/min in process speed and 5-20g/min in powder feeding rate. Main results obtained are summarized as follows: 1) It was made clear that formation of thick surface alloyed layer on aluminum alloy is possible by PTA overlaying process. 2) The range of optimum alloying conditions were much wider in case of Cu and Ni powder additions than the case of Cr powder addition judging from the surface appearance and the bead macrostructure. 3) Alloyed layer with Cu showed almost the homogeneous microstructure through the whole layer by eutectic reaction. alloyed layers with Cr and Ni showed needle-like and agglomerated microstructures, the structure of which has compound layer in upper zone of bead by peritectic and eutectic-peritectic reactions, respectively. 4) Microconstituents of the alloyed layer were analyzed as A1+CrA $l_{7}$ eutectics, C $r_{2}$al sub 11/, CrA $l_{4}$, C $r_{4}$A $l_{9}$ and C $r_{5}$A $l_{*}$ 8/ for Cr addition, Al+CuA $l_{2}$(.theta.) eutectics and .theta. for Cu addition, and Al+NiA $l_{3}$ eutectics. NiA $l_{3}$, N $i_{2}$A $l_{3}$ and NiAl for Ni addition. 5) Concerning defect of the alloyed layer, many blow holes were seen in Cr and Ni additions although there was lesser in Cu addition. Residual gas contents in blow hole for Cu and Ni alloyed layer were confirmed as mainly $H_{2}$ and a littie of $N_{2}$ Cracking was observed in compound zone of the alloyed layer in case of Cr and Ni addition but not in Cu alloyed layer.r.r.