Deposition Characteristics of Multitrack Overlayby Plasma Transferred Arc Welding on SS316Lwith Co-Cr Based Alloy – Influence ofProcess Parameters

Abstract

Plasma transferred arc welding (PTAW) is one of the outstanding overlay coating technique used in numerous industries including pressure vessel, automotive, chemical, nuclear, etc. owing to its superior characteristics, low dilution and high efficiency in the coating. In the present investigations, an effort is made to investigate the multitrack overlay deposition by PTAW on 16 mm thick 316 L plate by CO-Cr alloy. Samples are produced under different processing conditions, as per full factorial central composite design of experiment with preheating of 200°C by maintaining the interpass temperature 250 °C. Effects of transferred arc current, welding travel speed, powder feed rate, welding oscillation speed and stand-off distance on weld bead shape parameters comprising of width of deposition and reinforcement are presented and discussed based on experimental observations and fitted model. Relationship between the input process parameters with deposition characteristics is also presented in the form of regression equation. Lower current (100–120 A), intermediate travel speed (120–140 mm/min), intermediate powder feed rate (12–14 gms/min), lower oscillating speed (450–550 mm/min) and lower stand-off distance (6–8 mm) would give better deposition characteristics with minimum distortion, less residual stresses, no surface defects with strong metallurgical bond.

On the performance of weld overlay characteristics of Ni–Cr–Si–B deposition on 304 ASS using synergetic pulse-GMAW process

“…In the same way, Yaedu and D'Oliveira [15] and D'Oliveira et al [16] have investigated micro-hardness and wear performance of Co-based alloy on 304 ASS using PTA welding and laser cladding respectively. The effect of PTA welding process parameters on deposition characteristics of Co-Cr multitrack overlay on 316L ASS has been investigated by Deshmukh and Kalyankar [17].…”

The Effect of the Dilution Level on Microstructure and Wear Resistance of Fe-Cr-CV Hardfacing Coatings Deposited by PTA-P

“…However, in PTA, the dilution depends heavily on other welding parameters, such as welding current, plasma gas flow rate, material deposition rate, bead dimensions, and torch weaving. Thirty-seven variables that affect the PTA welding process have been identified, but finding the best combination of these parameters is highly complex and not trivial [29], and are outside the scope of the this paper.…”

Influence of Welding Position on Tribological Behavior of SS-309L Cladded Surface on 9Cr-1Mo Steel

“…As is shown in Fig. 6, Fe and Cr were core content elements for analysis since Fe content affects the outcomes of hardness and wear resistance [17,18] and Cr content affects the outcomes of sensitization that takes place during service conditions by Cr precipitation. The result proves that, Hardness could be witnessed on higher side in coating region due to decreased level of Fe content in fusion and coating zone.…”