Submerged-arc welding process method for welding H-shaped steel with web plate more than 16mm thick

Abstract

The invention relates to the technical field of welding of H-shaped steel and particularly relates to a back-chipping-free full-penetration submerged-arc welding process method for welding H-shaped steel with a web plate more than 16mm thick. The process method comprises the steps of material selection, edge preparation, assemblage of the H-shaped steel, positioned welding, preparation before welding, welding and the like, wherein the assemblage is required to be zero assembling, and an assembling interval is less than or equal to 0.5mm; the angles of K-shaped symmetrical beveled edges are designed to be at 60+ / -2 degrees, and the truncated edges of the beveled edges range from 1mm to 2mm; and the standard lengths of copper cushion blocks are designed to be 530mm and 130mm. The submerged-arc welding process method has the advantages of low cost, high efficiency, labor saving, reduction in environmental pollution and the like; and according to primary measurement and calculation, the welding process method can reduce the cost for welding the H-shaped steel with the web plate more than 16mm thick by 25%.

Description

technical field [0001] The invention relates to the technical field of H-shaped steel welding, in particular to a root-clearing-free full-penetration submerged arc welding process used for welding H-shaped steel with a web thickness greater than 16 mm. Background technique [0002] The traditional welding process of full penetration submerged arc welding of H-shaped steel requires that when the web thickness is greater than 16mm and full penetration is required, the back of the weld must be cleaned. Carbon arc gouging is a common method in the steel structure industry. The production efficiency of this method is about 4 times higher than that of the air shovel, especially when it is welded in all positions, it has greater advantages and relatively reduces the processing cost of the workpiece. When removing defects at the root of the weld, the surface is smooth and clean, but there are also the following disadvantages: 1) It is easy to add carbon to the channel, and the large...

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Problems solved by technology

[0002] The traditional welding process of full penetration submerged arc welding of H-shaped steel requires that when the web thickness is greater than 16mm and full penetration is required, the back of the weld must be cleaned. Carbon arc gouging is a common method in the steel structure industry. The production efficiency of this method is about 4 times higher than that of the air shovel, especially when it is welded in all positions, it has greater advantages and relatively reduces the processing cost of the workpiece. When removing defects at the root of the weld, the surface is smooth and clean, but there are also the following disadvantages: 1) It is easy to add carbon to the channel, and the large amount of smoke, dust, noise, arc radiation, etc. generated by the carbon arc will seriously pollute the environment and damage human health; The quality is not easy to control; 3) During carbon arc gouging, due to the input of a large amount of heat energy, it is easy to cause relatively large angular deformation and twist deformation of the component, and in severe cases, the component may even be scrapped, resulting in a waste of human, material and financial resources

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