This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Influence on Phosphate Pretreatments and Organic Coatings on the Sport Welding Characteristics of Zinc Coated Steels
Annotation ability available
Sector:
Language:
English
Abstract
This paper describes the influence of phosphate pretreatments and organic coatings on the resistance spot weldability of electrozinc coated steels. Measurement of the surface contact resistance of the pretreated layers, the determination of weld current ranges and electrode life tests were carried out. A very high degree of scatter in the contact resistance values was noted with both phosphated and organic coated steels. Resistance spot welding became more difficult as the phosphate and organic coating thickness was increased. When weldable, phosphated and organic coated steels possessed an acceptable welding range, although the electrode tip life was substantially reduced with increasing phosphate and organic coating thickness. In terms of ease of welding, the phosphate pretreatments and organic coatings studied may be rated in the following order; tricationic phosphate 2.5g/m2 (1.92μm), zinc-nickel/organic coating (Durazec) - 1μm, electrozinc/organic coating (Bonazinc 3000) - 3μm, and electrozinc/organic coating -7μm.
Recommended Content
Authors
Citation
Chatterjee, K., "Influence on Phosphate Pretreatments and Organic Coatings on the Sport Welding Characteristics of Zinc Coated Steels," SAE Technical Paper 982360, 1998, https://doi.org/10.4271/982360.Also In
References
- Schevo B.A. “Evaluation of spot welds made through primers and sealers” AWS Annual Spring meeting St. Louis April 14 - 18 1958
- Protnol N.D. et al Proiz Svar. “Characteristics of some protective coatings in resistance spot welding” 1970 10 43 45
- Barret L.D. “Weldable lead phosphate - Its properties and use” International rustproof Co SAE publication 1967 Paper Ref. 670075
- Becker Heinz “Influence of passivation films on electrogalvanised strip metal on the suitability of the material for spot welding” SAE publications Aug-Sept 1967
- Gould Jerry E. Kimchi Menachem Cambell Donald H. “Weldability and electrode wear characteristics of hot-dip galvanised steel with and without a Ferrophos containing primer” SAE 1988
- Takahasi Y. Saito T. Welding International 1994 8 4 262 268
- “Procedure for determining the life of spot welding electrodes”