Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 16, Issue 7, Pages 642-647Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1362171811Y.0000000047
Keywords
Friction stir spot welding; Ultra high strength steel; Wear testing; Joint strength
Funding
- DOE PNNL [116126]
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Friction stir spot welding has been shown to be a viable method of joining ultra high strength steel, both in terms of joint strength and process cycle time. However, the cost of tooling must be reasonable in order for this method to be adopted as an industrial process. Recently a new tool alloy has been developed, using a blend of polycrystalline cubic boron nitride (PCBN) and tungsten rhenium (W-Re) in order to improve the toughness of the tool. Wear testing results are presented for two of these alloys: one with a composition of 60% PCBN and 40% W-Re, and one with 70% PCBN and 30% W-Re. The sheet material used for all wear testing was 1.4 mm DP 980. Lap shear testing was used to show the relationship between tool wear and joint strength. The Q70 tool provided the best combination of wear resistance and joint strength.
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