Welding method for angle iron tower clad steel

Abstract

The welding method comprises the following steps that a first groove is machined in the inner side face of an angle steel butt welding seam, the first groove is filled with a first welding layer, and when the first welding layer is welded, the current ranges from 245 A to 285A, the voltage ranges from 27 V to 29 V, the welding speed ranges from 470 mm / min to 570 mm / min, and the heat input ranges from 7 kJ / cm to 10 kJ / cm; a second groove is machined in the outer side face of the butt welding seam, and the depth of the second groove extends to the center of the thickness of the first welding layer from the outer side face; the second groove is filled with a second welding layer, and when the second welding layer is welded, the current ranges from 245 A to 285A, the voltage ranges from 27 V to 29 V, the welding speed ranges from 470 mm / min to 570 mm / min, and the heat input ranges from 7 kJ / cm to 10 kJ / cm; the outer side of the second welding layer is filled with a plurality of welding layers. According to the invention, the one-time inspection qualification rate of the steel-clad first-grade welding seam of the angle steel tower is increased to 99%, and no defect position exists during nondestructive testing.

Description

technical field [0001] The invention relates to the technical field of angle steel tower welding, in particular to a welding method for cladding steel of an angle iron tower. Background technique [0002] Baotou Steel is mainly used to connect two adjacent angle steels on the angle steel tower. Baotou Steel includes two forms of inner curved clad steel and outer curved clad steel: inner curved clad steel such as image 3 As shown, cut and bend the angle steel to the desired angle and form a butt weld; Figure 4 As shown, the angle steel is cut and bent to the required angle to form a V-shaped mouth, and a triangular sheet is added to the V-shaped mouth, and a butt weld is formed between the two sides of the triangular sheet and the V-shaped mouth. . The welding process of Baotou Steel is to first clean the slag, grind and rust the butt weld, and then process the groove with the required angle at the butt weld, and apply the first groove to the root of the groove (that is, t...

AI Technical Summary

Problems solved by technology

The welding process of Baotou Steel is to clean the slag, grind and derust the butt weld first, and then process the groove of the required angle at the butt weld, and first apply the first step to the root of the groove (ie, the inner surface of the angle steel). Welding layer, and then the outer side welding, this traditional welding method has a pass rate of 64%, which seriously affects production efficiency

Images