FIELD: pipe welding, particularly, diffusion lap welding in vacuum of pipes from different materials. SUBSTANCE: rolling rollers are installed on free ends of three bars 3. Central bar 6 is installed in body 2 for rotation. Supporting roller 5 is fastened to end of central bar 6 for contact with each bar. Contact beads 8 are made on bars in places of contact with supporting roller 5 made of material the same as of contact beads and featuring Rockwell hardness not less than 40. EFFECT: guaranteed preservation of preset value of expansion of expanded pipe independent of value of arising forces, eliminated hazard of bar jamming in bearings. 3 cl, 2 dwg, 1 ex
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