Effects of expulsion in spot welding of cold rolled sheet steels

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Journal of Materials Engineering and Performance; (United States)

DOI:https://doi.org/10.1007/BF02648832· OSTI ID:5363664

Han, Z; Indacochea, J E ^[1]

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1. Univ. of Illinois, Chicago, IL (United States)

The effects of expulsion on microstructure and tensile shear strength of spot welds have been investigated for a high-strength cold rolled sheet steel. Spot welds with expulsion are characteristic for a double image'' near the fusion line, an equiaxed dendritic grain zone along the faying surface, and deep indentations on the outer surfaces. Microstructural examinations and tensile shear tests of spot welding specimens were conducted to determine the correlation between microstructure and strength. It was found that the equiaxed dendritic structure was associated with significant solidification cracking. Fractography on tensile specimens reveals that brittle failure is associated with an equiaxed microstructure. Furthermore, the surface indentation will change the stress at the nugget edge, and deep surface indentations are expected to promote premature failure.

• OSTI ID: 5363664
• Journal Information: Journal of Materials Engineering and Performance; (United States), Journal Name: Journal of Materials Engineering and Performance; (United States) Vol. 2:3; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHEMICAL COMPOSITION
DATA
EXPERIMENTAL DATA
FABRICATION
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NUMERICAL DATA
RESISTANCE WELDING
STEELS
TENSILE PROPERTIES
WELDED JOINTS
WELDING