JPH1128582A5 - - Google Patents

Claims (12)

A friction stir welding device is provided which performs butt welding or lap welding of two joining members (1) and (2), by inserting a rotating probe (12) into a butt joint (3) or overlapping portion of two joining members (1) and (2), and moving the probe (12) along the butt joint or overlapping portion while the contact portion with the probe is softened and stirred by frictional heat, or by moving the joining members (1) and (2) so that the probe (12) passes through the butt joint (3) or overlapping portion in sequence,
The friction stir welding apparatus is characterized in that a correction roller (50) is provided to apply pressure to the joint (4) joined by the probe (12). 2. The friction stir welding apparatus according to claim 1, wherein the correction roller is a rotatable roller equipped with a pressure mechanism. 3. The friction stir welding apparatus according to claim 1, wherein the correction rollers are a pair of upper and lower cylindrical rollers, and are arranged so as to face each other in the thickness direction of the flat plate portions (1 a) and (2 a) of both joining members (1) and (2). 4. The friction stir welding apparatus according to claim 3, wherein the gap between the straightening rollers is set to be slightly smaller than the thickness of the flat plate portions (1 a) and (2 a), and the straightening rollers lightly roll the joining members (1) and (2) passed between the upper and lower straightening rollers (50) and (51), thereby straightening the joining members (1) and (2) at the joining portion (4) to make them flat. 5. The friction stir welding apparatus according to claim 1, wherein a cooling medium injection nozzle (60) of the cooling device is fixedly disposed in the rear vicinity of the upper straightening roller (50) in the movement direction of both joining members (1) and (2) with its injection port directed toward the joining portion (4). A friction stir welding method is provided in which a rotating probe (12) is inserted into the butt joint (3) or overlapping portion of two joining members (1) and (2), and while the contact portion with the probe is softened and stirred by frictional heat, the probe (12) is moved along the butt joint or overlapping portion while the joining members (1) and (2) are moved so that the probe (12) passes through the butt joint (3) or overlapping portion in sequence, thereby performing a butt joining or lap joining of the joining members (1) and (2), characterized in that the joining portion (4) joined by the probe (12) is pressed with a correction roller. The friction stir welding method according to claim 6, wherein distortion of the joint is removed by applying pressure with the correction roller. 8. The friction stir welding method according to claim 6, wherein the correction rollers are a pair of upper and lower cylindrical rollers, and the pressure applied by the correction rollers is performed by the upper and lower correction rollers arranged so as to face each other in the thickness direction of the flat plate portions (1 a) and (2 a) of both joining members (1) and (2). 9. The friction stir welding method according to claim 6, wherein the gap between the straightening rollers is set to be slightly smaller than the thickness of the flat plate portions (1 a) and (2 a), and the joining members (1) and (2) passed between the upper and lower straightening rollers (50) and (51) are lightly rolled to straighten and flatten the joining members (1) and (2) at the joining portion (4). 10. The friction stir welding method according to claim 6, wherein the joining portion is forcibly cooled by a cooling medium injection nozzle (60) of a cooling device installed in the rear vicinity of the upper straightening roller (50) in the movement direction of both joining members (1) and (2). 11. The friction stir welding method according to claim 6, wherein the two joining members are joined using joining members having a thick portion formed at the butt joint portion, and the joining portion is pressed by a roller. A welded article welded by the friction stir welding method according to any one of claims 6 to 11.