Difficulty In Welding and Effect of Pwht On Low Alloy Steel 42CrMo4 (EN19) Using Smaw Process

Manoj Kumar , Aman Aggarwal , Vivek Khokhar

SAW: Submerged arc welding, SMAW: Shield metal arc welding, GMAW: Gas metal arc welding, FCAW: Flux cored arc welding, HAZ: Heat affected zone, NDT: Non-destructive testing, UT: Ultrasonic Testing, DPT: Dye Penetrant Testing, MPI: Magnetic particle investigation, NAWD: Non-aqueous wet developer PWHT: Post weld heat treatment, Process Parameters, Cooling rate, Heat Input, Microstructure, Current, Voltage. Heat input, Heat input, CE: Carbon equivalent.

42CrMo4 (EN19) steel is a high-quality engineering alloy steel containing chromium and molybdenum as major alloying elements. It falls in class of low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength properties. These properties allow it’s use in various industries worldwide. Welding of 42CrMo4 steel further could help and facilitates engineers to achieve various complicated structurer like machinery and complex structural designs. But due to high carbon percentage, carbon equivalent value and its hardness it is difficult to weld 42CrMo4 Steel and very rare in the industry. EN19 material requires welding techniques that are robust enough to handle the high heat generated without losing parent material strength and quality. Welders & Welding operators generally face challenges when welding 42CrMo4 material mainly due to thermal cracking. Extreme care shall be taken during welding of 42CrMo4 steel due to high carbon equivalent percentage. Also Due to uneven heating and cooling, complex stresses and strains are produced which further produce distortion and residual stresses in the final job. Welding operation to be performed on 42CrMo4 steel with proper preheating, intermediate heating, post heating and Post weld heat treatment cycle at 690°C with the electrodes / filler wires with low PPM of hydrogen diffusion. To study the the cumulative effect of all the process including test coupons of with PWHT & without PWHT condition welded in the same range of parameters need to be mechanical tested for hardness, tensile, Impact, Macro-etch, microstructure, surface NDT, sub surface NDT and volumetrically NDT tested.

Published Paper   E-Certificate

"Difficulty In Welding and Effect of Pwht On Low Alloy Steel 42CrMo4 (EN19) Using Smaw Process", IJSDR - International Journal of Scientific Development and Research (www.IJSDR.org), ISSN:2455-2631, Vol.9, Issue 8, page no.252 - 261, August-2024, Available :https://ijsdr.org/papers/IJSDR2408031.pdf

Volume 9 Issue 8, August-2024

Pages : 252 - 261

Paper Reg. ID: IJSDR_212304

Published Paper Id: IJSDR2408031

Downloads: 000347382

Research Area: Engineering

Country: -, -, India

Published Paper PDF: https://ijsdr.org/papers/IJSDR2408031

Published Paper URL: https://ijsdr.org/viewpaperforall?paper=IJSDR2408031

ISSN: 2455-2631 | IMPACT FACTOR: 9.15 Calculated By Google Scholar | ESTD YEAR: 2016

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