Method for welding butt-jointed seam of upward plate through manual arc welding

Abstract

The invention relates to a method for welding a butt-jointed seam of an upward plate through manual arc welding, which comprises the following steps of: (1) burnishing the groove and 10-15 mm range of the surface of a test piece to have metallic luster, assembling and pairing the test piece, wherein the included angle between the groove face and the central vertical face is 30-35 DEG, the length of a root gap is 3.0-4.0 mm, the length of the truncated edge is 1.5-2.0 mm, and the unfitness of butt joint is less than 0.5 mm; (2) performing positioned welding on both ends of the test piece, wherein the length of the welding spot is 10-15 mm; and (3) adopting a layered lane welding process for the welding sequence. In the method, a linear or lateral small swing electrode manipulation manner is adopted for welding, therefore, the operation is simple and easy to master; welding joints are reduced, and the defects of porosity, slag inclusion, incomplete fusion and the like at the joints are prevented; the temperature of the molten bath is effectively controlled, and weld beading formed by the burnthrough of the root layer is prevented; the heat input of the weld seam is reduced, and the plasticity and the tenacity of the weld seam are effectively increased.

Description

technical field [0001] The invention relates to a novel welding method for butt weld seams of overhead plates by manual arc welding during welder training and on-site construction. Background technique [0002] In the process of welding training and on-site construction, when using manual arc welding to weld the butt weld of the back plate, the welding method of multi-layer single-pass welding is usually used. This method has the following disadvantages: 1. It is for welders who lack on-site construction experience; 2 Difficult to operate, difficult to master, difficult to control molten pool temperature and arc height during welding, large tendency of molten iron to fall, easy to burn welders; 3 Difficult to control relative to the internal quality of welds, especially easy Welding defects such as lack of fusion between layers, dense pores, and slag inclusions occur; 4. It is difficult to control the appearance of the weld, and it is easy to produce welding defects such as ...

AI Technical Summary

Problems solved by technology

[0002] In the process of welding training and on-site construction, when using manual arc welding to weld the butt weld of the back plate, the welding method of multi-layer single-pass welding is usually used. This method has the following disadvantages: 1. It is for welders who lack on-site construction experience; 2 Difficult to operate, difficult to master, difficult to control molten pool temperature and arc height during welding, large tendency of molten iron to fall, easy to burn welders; 3 Difficult to control relative to the internal quality of welds, especially easy Welding defects such as lack of fusion between layers, dense pores, slag inclusions, etc.; 4 It is difficult to control the appearance of the weld, and it is easy to produce welding defects such as poor surface shape, too high or disjointed joints, and undercuts

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