Manual arc welding bottoming layer Z-shaped arc extinction method and application thereof in Q460 high-strength steel horizontally-fixed steel pipe butt welding

Abstract

The invention discloses a manual arc welding bottoming layer Z-shaped arc extinction method and application of the manual arc welding bottoming layer Z-shaped arc extinction method in Q460 high-strength steel horizontally-fixed steel pipe butt welding. An arcing point is located at a position of a root part of a groove 2 to 3mm close to a truncated edge, an electric arc is lightly led to an oblique rear part of a fusing tank along the groove after being struck and then transversely swung to the other side of the groove after a pause, act extinction is carried out towards the oblique rear part of an arcing point after fusing of the groove at the side is good through observation, and a running track of an end of a welding rod is Z-shaped. As the fusing tank can be well observed in a welding process, welding defects of a bottoming layer can be reduced and technical support is provided to ensure welding quality of the bottoming layer of a butt joint. With the adoption of the arc extinction method, shaping of the root part of a welding seam can be effectively controlled and a good welding seam structure can be obtained.

Description

technical field [0001] The invention relates to a butt welding process using manual arc welding, and more specifically relates to a novel primer welding process and its application in butt welding of Q460 high-strength steel horizontally fixed steel pipes. Background technique [0002] When the butt weld is welded by manual arc welding, the one-point arc extinguishing method or the two-point arc extinguishing method is generally used. These two methods have the following disadvantages: one-point arc extinguishing method, the end of the electrode points to the middle of the weld during the arc combustion process During the welding process, it is easy to produce excessive root protrusion or weld defect; two-point arc extinguishing method, the electrode tip quickly clicks on both sides of the root of the test piece during the arc combustion process to form a molten pool. If the arc extinguishing frequency is faster during the welding process, Then the molten pool is not easy to...

AI Technical Summary

Problems solved by technology

[0002] When the butt weld is welded by manual arc welding, the one-point arc extinguishing method or the two-point arc extinguishing method is generally used. These two methods have the following disadvantages: one-point arc extinguishing method, the end of the electrode points to the middle of the weld during the arc combustion process During the welding process, it is easy to produce excessive root protrusion or weld defect; two-point arc extinguishing method, the electrode tip quickly clicks on both sides of the root of the test piece during the arc combustion process to form a molten pool. If the arc extinguishing frequency is faster during the welding process, Then the molten pool is not easy to observe, and slag inclusion defects are easy to occur. If the arc extinguishing frequency is slow, welding burrs are easy to occur

At this stage, most of the Q460 high-strength steel welding processes in various industries use manual arc welding. During the welding training and on-site construction, there are the following problems: 1. The welding process is not properly formulated; 2. The welding process parameters are unreasonable; 3. The weld seam is easy to produce Welding defects such as poor forming and excessively uneven weld bead

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