The effect of continuous and pulsed current on microstructure and mechanical properties in TIG welding of Al-Si alloy sheets


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Durgutlu A.

KOVOVE MATERIALY-METALLIC MATERIALS, vol.54, no.5, pp.345-350, 2016 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 5
  • Publication Date: 2016
  • Doi Number: 10.4149/km_2016_5_345
  • Journal Name: KOVOVE MATERIALY-METALLIC MATERIALS
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.345-350

Abstract

In this experimental study, Al-Si alloy sheets were joined through TIG welding method by using continuous current and pulsed current. Tensile test, bending test, hardness test, and microstructure examination of joined test samples were carried out in order to see the effect of current type on mechanical properties of welded samples. Experimental results showed that pulsed current led to low heat input, grain refinement, and hardness increase in weld metal compared to alternative current. The samples joined by using the pulsed current showed higher tensile strength than the samples welded by using the alternative current. After bending test, cracks, tearing, and surface defection were not observed in the samples.