Thin sheets of austenitic stainless steel (SS304) are assembled using various pulse parameters of pulsed current gas tungsten arc welding. The sheets are joined with high welding speed for higher production rate, but the mean current is enhanced with higher welding speed for maintaining required heat input to get a sound joint. Application of pulsed current gas tungsten inert gas welding for joining of SS304 has been found advantageous in the form of production of weld joints with better mechanical and metallurgical characteristics. It has been observed that there can be elimination or lesser humping in weld joints. Undercut or dipped weld faces are also not found due to application of pulsed current. There is improvement of tensile strength and hardness by 12.5 and 12%, respectively. The enhanced tensile strength and hardness is justified through TEM micrograph showing presence of dislocation.

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Butt weld joints are prepared using pulse current gas tungsten arc welding out of thin sheets of AISI 1008 steel using various combinations of pulse parameters. During welding, the welding speed was kept high, but with the increase of welding speed the mean current was also increased to get the required weld joint at the constant heat input. The use of pulse current has led to improvement in mechanical and metallurgical properties of weld joints. It has resulted in less development of humping which is a common problem with high-speed welding. The undercut or dipped weld face is not observed severe. The tensile strength and hardness are enhanced by 12.5 and 12%. The increase of tensile strength and hardness is justified through TEM micrograph showing the presence of dislocation.@en