Methods for the preparation of welded components for argon-shielded arc welding of thin sheet structures

摘要

In welding structures with long welded joints, the problems of preventing the formation of unacceptable internal defects (oxide inclusions and pores) are very important. The formation of these defects is associated with disruptions of the technology of preparation of the surface of welded components, areas missed in scraping, and the excessively long storage time of the prepared surfaces. In this work, investigations were carried out into the effect of the surface preparation, areas in which scraping was not conducted, and deposition of fluxes - suspensions on the formation of porosity in the welded joints. The results show that the minimum total volume of the discontinuities is characteristic for welded joints produced by argon-shielded arc welding using small amounts of alcohol suspensions of the flux deposited on the penetration side. Areas of the edges with no scraping are permitted in this case.