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The Effects of Coating Composition, Substrate, and Welding Machine on the Resistance Spot Welding Behavior of Hot-Dip Galvanized and Galvannealed Sheet Steels
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 28, 1999 by SAE International in United States
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This joint research study by Bethlehem Steel Corporation and the U. S. Steel Group of the USX Corporation reveals that several significant factors affect the welding performance (electrode life) of hot-dip galvanized and galvannealed sheet steels. The statistical analyses of the electrode life data reveal that coating aluminum content affects electrode wear behavior of both the hot-dip galvanized and the galvannealed coatings. Higher levels of aluminum content cause more rapid electrode wear and shorten electrode life. Iron content in the galvannealed coatings seems to have some positive effect on increasing electrode life, but its effect is not nearly as significant as the negative effect of aluminum content. As the Fe/Al coating content ratio of galvannealed coatings increases, electrode life increases. Substrate type also affects electrode life, with the IF grade consistently producing shorter electrode lives. This behavior is related to the lower bulk resistance (lower resistivity) of IF steels and the higher welding currents required to weld them. The welding machines of both laboratories were also noted to have a significant effect on electrode life, with Bethlehem's machine generally producing longer electrode lives.
CitationHowe, P. and Chen, C., "The Effects of Coating Composition, Substrate, and Welding Machine on the Resistance Spot Welding Behavior of Hot-Dip Galvanized and Galvannealed Sheet Steels," SAE Technical Paper 1999-01-3213, 1999, https://doi.org/10.4271/1999-01-3213.
- Cole, F. J. “Effect of Aluminum, Lead, and Antimony Concentration on Spot Welding of Galvanized Steel,” Republic Steel Research Report June 1976
- Dickinson, D. W. “Welding in the Automotive Industry,” AISI Research Report SG81-5 August 1981
- Domis, W. R. “Spot Weldability of GP60XF70 Galvanized Sheet Steel,” U. S. Steel Corp. internal report 33-C-300(002-1) November 28 1983
- Howe, P. “The Effect of Aluminum in Hot-Dip Galvanized Sheet Steel on Electrode Life - A Compilation of Research Data,” Bethlehem Steel Corp. internal report July 30 1996
- Matsuda, Hiroshi et al. “Effect of Aluminum on Spot Weldability of Hot-dipped Galvanized and Galvannealed Steel Sheets,” Paper 1-5 of AWS Sheet Metal Welding Conference VIII proceedings October 14 1998
- Auto/Steel Partnership Welding Task Force, Electrode Wear Mechanisms Project “Mechanisms of Electrode Wear During Spot Welding Hot-Dipped Galvanized Steel,” A/SP Technical Report March 1994
- Gugel, M. D. White, C. L. Kimchi, M. Pickett, K. “The Effect of Aluminum Content in HDG Coating on the Wear of RSW Electrodes,” Paper D3 of AWS Sheet Metal Welding Conference VI proceedings October 1994
- Kimchi, M. Pickett, K. Gugel, M. D. White, C. L. “Weldability and Electrode Wear During RSW of Various HDG Steels,” Paper D2 of AWS Sheet Metal Welding Conference VI proceedings October 1994
- Howe, P. Kimchi, M. “The Effects of Coating Type and Spot Welding Machine Type on Electrode Life Behavior Using Accelerated-Wear and Standard Electrode Life Tests,” A/SP Technical Report November 9 1995
- Howe, P. “The Effect of Spot Welding Machine Characteristics on Electrode Life Behavior,” Paper A3 of AWS Sheet Metal Welding Conference VII proceedings October 1996
- A/SP Weld Quality Test Method Manual 10 31 97 Auto/Steel Partnership