REGULARITIES OF WELD PREPARATION AND FIT-UP TECHNOLOGICAL PROCESS INFLUENCE ON FAULTLESS OF WELDED CONNECTIONS FORMATION

Joint preparation (root face), overmatched size of the gap, bad fit-up, misalignment, not completed removal of rust, oil and incorrect tack welds are main factorial parameters. Experiments were carried out to confirm theoretical results and to establish schematics of defects, which were formed in production welds when dominated factors were negative. Research as conducted during construction of technological pipelines of different size with shielded arc welding (SAW), GMAW in CО₂ and Ar + CО₂ and GTAW. Welding was performed at certified production welding laboratories in accordance with tasks of the State Programs in scientific research. Results confirmed data from previous study in statistical analyzing of defects occurring. It is concluded that negative factors of joint preparation are the cause of forming of defects structure which is unique, related to this only factor.

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