Structural Integrity of Spot-Welds Used for Auto-Body Fabrication

Abstract:

The effects of weld nugget size, base metal strength, mode of loading and pre-strain of base metal on the load bearing capacity of spot-welds have been investigated using two varieties of interstitial free steel sheets. The effect of bake hardening treatment after spot-welding of prestrained sheets has also been examined using an ultra low carbon bake hardening grade steel. The major results infer that: (i) the load bearing capacity of spot-welds increases with increasing nugget size and base metal strength, (ii) the load bearing capacity of spot-welds increases with increasing pre-strain of base metal, (iii) the remnant dislocation density around the spot-weld increases with increasing pre-strain, (iv) the strength of spot-welds on pre-strained sheets does not alter significantly after the baking treatment, but baking treatment increases the strength of pre-strained base metals, and (v) the location of failure is commonly at the interface of HAZ/base metal for tensile-shear specimens and at the HAZ for cross-tension specimens.

• Periodical: Advanced Materials Research (Volumes 264-265)
• Pages: 427-432
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.264-265.427
• Online since: June 2011
• Authors: Kalyan Kumar Ray, G. Mukhopadhyay
• Keywords: Bake-Hardening Steel, Load-Bearing Capacity, Pre-Strain, Spot Weld

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