摘要
An attempt has been made to study the tailor welded blanks （TWBs） made by friction stir welding （FSW） with five different tool pin profiles. The formability of welded blanks was evaluated at constant FSW process parameters. It has been found that the welded blanks with square pin profile tool produced better formability properties as compared to other tool pin profiles. It was found that the pulsating action of the square pin profile is said to be the reason for this improvement. A microstructural evaluation performed on the blanks revealed that the stir zone created by taper cylindrical and stepped cylindrical tools was less homogeneous than that of the square tool, resulting in less formability. The limiting dome height （LDH） of square pin profile tool was found to be 14 mm while those of taper cylindrical and stepped cylindrical tools are 12.5 mm and 12.4 mm, respectively.
研究采用5种形状搅拌头搅拌摩擦焊接拼焊板。在相同搅拌摩擦焊工艺参数下研究了拼焊板的成形性。研究结果表明,与其他形状搅拌头相比,方形搅拌头制备的拼焊板具有更好的成形性,这是由于方形搅拌头具有搏动效应。显微组织研究表明,与方形搅拌头相比,锥形和阶梯圆柱状搅拌头焊接板材的搅拌区组织更不均匀,导致成形性较差。方形搅拌头的极限顶高为14 mm,而锥形和阶梯圆柱状搅拌的极限顶高分别为12.5 mm和12.4 mm。
基金
financial support under the SERC scheme (SR/S3/MERC0110/2009 dated July 30,2010) to Dr M J DAVIDSON
