The effect of paint bake treatment on the properties of FSSWs in AA6111-T4 automotive sheet
- Liu S.F. ,
- Chen Y.C. ,
- Bakavaos D. ,
- et al
- Liu S.F. ,
- Chen Y.C. ,
- Bakavaos D. and
- Prangnell P.B.
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Description
An investigation is presented into the effect of a paint bake cycle on the performance of friction stir spot welded (FSSW) joints fabricated in heat-treatable 6111-T4 aluminium alloy automotive sheets (thickness 0.93 mm) using a pinless tool and short welding times (less than 1 s). FSSW trials were conducted under displacement control in a CS Powerstir friction stir welding machine using a pinless tool with a fluted shoulder design. The main process parameters incorporated a rotational speed of 2000 rpm, a plunge rate of 2.5 mm/s and a plunge depth of 0.2 mm. The paint bake cycle used in industry was simulated by artificial ageing at 180 deg.C for 30 min. Weld zone microstructure was observed by high resolution SEM and fine scale precipitation by TEM. Microhardness measurements and lap shear tests were performed immediately after welding and following PWHT.
9th International Symposium, 15-17 May 2012, Poster Session, Paper 07
Subjects
- Friction welding
- Welding
- Process
- Friction stir spot welding
- Aluminium and Al alloys
- Nonferrous
- Material
- 6xxx Al series
- Mechanical properties
- Properties
- Hardness
- Microstructure
- Heat treatment
- PWHT
- Weld zone
- Weld
- Thermomechanically affected zone
- HAZ
- Strength
- Shear strength
- Coatings
- Surfacing
- Nonmetallic coatings
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