METHOD OF CONTACT BUTT WELDING WITH PREHEATING AND TEMPERATURE CONTROL OVER DIFFERENT CROSS-SECTION ARTICLES Russian patent published in 2014 - IPC B23K11/04 B23K31/12 B23K37/00 

FIELD: process engineering.

SUBSTANCE: invention relates to welding, particularly, to contact butt fusion welding. Proposed method comprises fitting an clamping the articles to be welded in welding jaws, preheating by current, controlling temperature distribution, heating of particles and fusion and upsetting. Sticker strips are applied to the end of made-to-measure specimen opposite the welded end. Temperature distribution is controlled by colour variation or sticker strip fusion. In case colour leveling or fusion of all sticker strip, preheating time is memorised to output instruction for fusion and welding of ends with fixing of preset heating time in welding. Now, articles are welded together with allowance for set time.

EFFECT: higher quality of welded joints.

2 dwg