Case study – 0.5” (12.7mm) carbon steel
0.5’’ (12.7mm) steel (EH36) butt welding with SuperMIG®
Comparison with conventional GMAW
Table 1- Welding results comparison
Macrostructural Appearance – Plasma/GMAW and GMAW
Weld EH36 -LIN119 – Machined plate edges, as rolled mill scale on root and face sides
Welding Effects on the Heat Affected Zone
Hybrid Weld LIN153
- The HAZ microstructure was very gradual from coarse at the weld side to very fine towards the base plate,
- Remaining rolling direction bands still visible in the HAZ – Heat Affected Zone,
- No defects such as porosity or discontinuities were observed.
GMAW Only – Weld LIN1158
- The HAZ microstructure is finer and slightly shorter than that of the hybrid weldment,
- The weld did not show the appearance of defects such as, porosity or discontinuities.
Table 2 – Tensile properties summary
Hybrid Plasma and GMAW welding of 0.5” (12.7mm) thick EH36 plate offers the advantage of producing superior welds; lower preparation angle, one pass weld (double throughput) with tensile strengths compared to conventional GMAW process.