Mechanical surface of the parts subject to heating and melting during welding, called welded edges. To ensure the penetration of the edges depending on the thickness of the base metal (S) and the welding process gives them the most optimal form, performing pre-edge preparation. The main parameters of the form prepared by the edges and collected weld joints are /, R, c, b, and -, respectively, flanging height, radius, blunt edges, a gap, the angle of the bevel angle of cutting edges. Uncut portion of the edges with a known blunt edges, the distance b between the edges of the assembly – a gap, a sharp angle p between the plane of the bevel edge and the plane end – bevel angle, the angle between a chamfered edges – cutting the corner. Flare edges are used for welding thin-walled parts. On thick-walled parts perform Cutting edge by a straight or curved oblique bevel the edges to be welded. The type and angle cutting edges determines the number needed to fill the electrode metal cutting, and hence the productivity of welding.
When an X-shaped cutting edge in comparison with the V-shape can reduce the amount of deposited metal in 1,6 1,7 times. In addition, such cutting provides less amount of strain after welding. When an X-shaped and V-shaped cutting edge blunts for the correct formation of the seam and prevent burn-through. The gap in the assembly weld is determined depending on the thickness and chemical composition of the welded alloys, the welding, construction connected parts and the connection type.