Effect of heat input on weld bead geometry of submerged arc welded ASTM A709 Grade 50 steel joints

This paper discusses the effect of welding parameters on the size of the heat affected zone (HAZ) and its relative size as compared to the weld bead of submerged arc welding. It is discovered that the welding parameters influences the size of weld bead and HAZ differently which can be relate to the effect of welding parameters on the various melting efficiencies. This difference in behavior of HAZ and weld bead can be explored to minimize the harmful effect of HAZ in future welds.

Effect of Welding Parameters on the Size of Heat Affected Zone of Submerged Arc Welding

Study of fundamental parameters in hybrid laser welding

https://depositonce.tu-berlin.de/bitstream/11303/11253/1/sproesser_etal_2016.pdf

Increasing Performance and Energy Efficiency of Gas Metal Arc Welding by a High Power Tandem Process

This paper investigates gas metal arc welding (GMAW) with respect to energy consumption and its associated environmental impacts. Different material transfer modes and power levels for single wire GMAW (SGMAW) and tandem GMAW (TGMAW) are evaluated by means of the indicator electrical deposition efficiency. Furthermore, the wall-plug efficiency of the equipment is measured in order to describe the total energy consumption from the electricity grid. The results show that the energy efficiency is highly affected by the respective process and can be significantly enhanced by a TGMAW process. The wall-plug efficiency of the equipment shows no significant dependency on the power range or the material transfer mode. Moreover, the method of life cycle assessment (LCA) is adopted in order to investigate the influences of energy efficient welding on the environmental impacts. In the comparative LCA study, the demand of electrical energy is reduced up to 24%. In consequence, the indicator values for global warming potential (100), acidification potential, eutrophication potential, and photochemical ozone creation potential are reduced up to 11%.

Environmental energy efficiency of single wire and tandem gas metal arc welding

The effect of process variables such as current, voltage, electrode extension, electrode diameter, etc., on the electrode melting and plate melting efficiencies of submerged arc welding (SAW) and gas metal arc welding (GMAW) has been studied. It has been shown that there is an increase in the electrode extension or a decrease in the voltage and electrode diameter. For the same welding parameters, the electrode melting efficiency is higher when the electrode is negative. A similar relationship was observed for GMAW. The results also indicated that the shielding gas in GMAW also had an effect on the electrode melting efficiency. The plate melting efficiency of GMAW increases with an increase in the welding current, voltage, and electrode diameter, and decreases with an increase in the electrode extension. For the same welding parameters, the plate melting efficiency is lower when the electrode is negative. For SAW there is an increase in the plate melting efficiency with an increase in the welding c...

R. S. Chandel

Papers

Electrode melting and plate melting efficiencies of submerged arc welding and gas metal arc welding