Analysis of thermo-mechanical conditions in spot welding of steels
- Leitao C. ,
- Andrade D. and
- Rodrigues D.
- Leitao C. ,
- Andrade D. and
- Rodrigues D.
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Description
Spot welds were fabricated in DC01 mild steel and HC 420-LA high strength steel sheets (thickness 1 mm) by friction stir spot welding (FSSW) using various pinless tools and process parameters, and thermographic analysis together with microstructural examination were employed to establish the relationship between process parameters, parent material characteristics, heat generation and weld strength. Welding was conducted in a three-step operation comprising plunging, dwell and drawing-out periods. Tool rotational speed was varied in the range 870-1500 rpm. Temperature was measured with a thermographic camera. Welded joint microstructure was observed by optical microscopy. Microhardness was measured using a Shimadzu tester with a load of 200 g and a holding time of 15 s. The relationship between normalised hardness, rotational speed and cooling rate is discussed.
12th International Symposium, 26-28 Jun 2018, Session 11B: FSSW II, Paper 02
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