scholarly journals Composite Alloying of Metal Surface by Plasma Transferred Arc Welding Process.

1992 ◽  
Vol 31 (12) ◽  
pp. 1056-1063 ◽  
Author(s):  
Tomoki Tomita ◽  
Yasuyuki Takatani ◽  
Yoshio Harada
Keyword(s):  
Metal Surface ◽  
Arc Welding ◽  
Welding Process ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Arc Welding Process ◽  
Plasma Transferred Arc Welding

Improvement of Wear Property of NBC/High Cr-High Ni Overlay Alloy Coating Formed by Plasma Transferred Arc Welding Process

1998 ◽  
Author(s):  
T. Tomita ◽  
K. Okita ◽  
Y. Taratani ◽  
Y. Harada
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Wear Property ◽  
Continuous Precipitation ◽  
Α Phase ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Isothermal Ageing ◽  
Arc Welding Process ◽  
Plasma Transferred Arc Welding

Abstract In order to improve the wear property of high Cr - high Ni overlay alloy coatings with dispersed NbC particles formed by PTA (Plasma Transferred Arc) welding process, the isothermal ageing at 773 ~ 1023K was carried out. The precipitation behavior and the wear property of the NbC-dispersed alloy were examined, compared with the NbC-free alloy, by using vickers hardness tester, SEM, TEM, EDX, XRD and Ohgoshi wear tester. It has been found that the hardness of the NbC-dispersed alloy increased by the isothermal ageing without a solution heat-treatmnet after PTA welding, its age-hardenability is higher than the NbC-free alloy and consequently the wear property is remarkbly improved. This is probably due to a continuous precipitaion of α '- phase. Namely, although, in the NbC-free alloy, both a nodular precipitation of α '-phase and a continuous precipitaion of α '-phase occurred, in the NbC dispersed alloy, any precipitation can't be observed except for the continuous precipitation of α '- phase. It is considered that such different precipitation behaviors have been caused by niobium atoms dissolved in the matrix of the NbC-dipersed alloy.

Influence of Heat Treatment on Characteristic Behavior of Co-Based Alloy Hardfacing Coatings Deposited by Plasma Transferred Arc Welding

2011 ◽  
Vol 462-463 ◽  
pp. 593-598 ◽  
Author(s):  
Hong Xia Deng ◽  
Hui Ji Shi ◽  
Seiji Tsuruoka ◽  
Hui Chen Yu ◽  
Bin Zhong
Keyword(s):  
Residual Stresses ◽  
Vickers Hardness ◽  
Arc Welding ◽  
Steel Substrate ◽  
Heat Treatments ◽  
Material System ◽  
Coating Surface ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Plasma Transferred Arc Welding

The Plasma transferred arc welding (PTAW) is widely used for hardfacing components exposed to severe conditions. Without post welding heat treatments, large tensile residual stresses remain in the hardfacing coating, which is detrimental. In this paper, a set of post welding heat treatments was evaluated for the heat-resistant steel substrate – Co-based alloy hardfacing coating system. Microstructural and mechanical properties, including the chemical phases of coating surface, the microstructure of coating surface, the Vickers hardness and the residual welding stress, were investigated before and after the heat treatments. Results revealed that during the heat treatments, some elements reprecipitated and the secondary carbide Cr23C6 was formed. After the treatments, a more regular structure and a higher Vickers hardness were obtained. Moreover, the tensile residual stresses in the coating decreased significantly. Therefore, it can be inferred that the post welding heat treatments employed in this paper were proper for this material system.

Process Parameter Effects over Bead Properties during Material Deposition of PTAW Process

2020 ◽  
Vol 978 ◽  
pp. 55-63
Author(s):  
Soumen Mandal ◽  
Subrata Kumar ◽  
Manish Oraon
Keyword(s):  
Process Parameters ◽  
Arc Welding ◽  
Welding Process ◽  
Fusion Welding ◽  
Bead Geometry ◽  
Plasma Transferred Arc ◽  
Surface Method ◽  
Material Deposition ◽  
Bead Height ◽  
Plasma Transferred Arc Welding

The quality and geometry of deposited bead depend on their input process parameters and their interaction effects in fusion welding process. Minimum dilution and maximum bead size are the most desirable property in material processing applications. The effects of process parameters on dilution and bead geometry have been analysed during material deposition by Plasma Transferred Arc Welding (PTAW) process using the response surface method. The experimental data are used for modelling using three level factorial techniques. The mathematical models have been developed for bead height, width and dilution. The accuracy of the models has been checked using the analysis of variance. The effects of process parameters on bead geometry and dilution have been investigated.

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