Welding method achieving medium thick plate backing welding without back gouging

Abstract

The invention discloses a welding method achieving medium thick plate backing welding without back gouging. The welding method comprises the steps of backing welding and filling welding, wherein double-face double-arc asymmetry welding is adopted in the backing welding, double-face double-arc symmetry welding is adopted in the filling welding, an assembling clearance between root portions of two welding plates is 4-6 millimeters, the angle of a welding gun is 70-85 degrees, standing time of a side wall when the welding gun swings is 0.3-0.6 second, and the amplitude of swinging of the welding gun of the backing welding is more than 5 millimeters. The welding method is suitable for vertical position welding of a medium thick plate with the thickness of more than 20 millimeters, the backing welding without the back gouging can be achieved, and therefore a traditional medium thick plate welding process is simplified, production efficiency is improved, and deformation of workpieces does not exist basically after the welding. In addition, the welding method further achieves automatic welding of a robot of the medium thick plate easily.

Description

technical field [0001] The invention relates to a welding method suitable for realizing root welding of medium and thick plates without clearing the root, and belongs to the field of welding technology. Background technique [0002] Plate welding is widely used in the fields of ships, mining machinery, high pressure vessels, marine engineering and heavy machinery, especially in the shipbuilding industry, where welds of medium and heavy plates account for more than 70%. At present, the welding methods used in the welding of medium and thick plates are mainly manual welding and semi-automatic welding. The traditional single-arc welding process is: front preheating → front welding → reverse gouging → grinding groove → magnetic particle flaw detection → reverse preheating → reverse welding → post-heating. Using a single arc to weld medium and thick plates produces a large welding stress, which makes the welding workpiece prone to large stress deformation, and the correction aft...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing medium and thick plate welding method, which are complicated in process, low in efficiency and not suitable for automatic robot welding, and provide a welding method for realizing the root welding of medium and heavy plates without clearing the root

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