Case study – 0.5” (12.7mm) carbon steel

0.5’’ (12.7mm) steel (EH36) butt welding with SuperMIG®

Comparison with conventional GMAW

comparison-with-gmaw

Table 1- Welding results comparison

Macrostructural Appearance – Plasma/GMAW and GMAW

macrostructural-appearance

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

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

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.

 

Tensile Properties

tensile-properties-0-5

Table 2 – Tensile properties summary

 

Conclusions:

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.