Thick plate vertical butt joint welding method

Abstract

The invention discloses a thick plate vertical butt joint welding method. A butt joint welded part is provided, and is provided with a groove for welding; the CO2 gas shielded welding is adopted to weld in the groove to form a welding line bottom layer; and the vertical electrogas welding is adopted to weld on the welding line bottom layer to finish remained groove filling. The CO2 gas shielded welding is adopted to firstly weld the groove to form the welding line bottom layer difficult to thoroughly weld on the bottom or the back surface of the groove in the groove, so that the welding quality of the subsequently adopted vertical electrogas welding is guaranteed; and the two welding modes are combined to weld thicker butt joint welded part, so that the operation difficulty can be reduced, the welding quality is improved, and the welding heat input quantity also can be effectively reduced.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a vertical butt welding method for thick plates. Background technique [0002] In the pre-loading and loading stages of the shipbuilding industry, vertical gas-electric welding is generally used for welding longer vertical butt welds. During welding, ceramic liners or copper liners are attached to the back of the plate butt groove, and one-time welding The front and back sides are formed to complete the welding of the entire vertical butt weld. This welding method is generally applicable to the butt joint of the plate thickness less than 32mm. When the thickness of the plate is greater than 32mm and the plates with special requirements in terms of strength or toughness are vertically butt-jointed, CO2 semi-automatic or multi-layer multi-pass automatic welding must be used for welding. [0003] The existing thick plate vertical butt welding welding method has the following defec...

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Problems solved by technology

[0003] The existing thick plate vertical butt welding welding method has the following defects: 1. If vertical gas electric welding is used for thick plate welding, the requirements for steel plates and filler materials are relatively high. If imported steel plates and filler materials are not used, the welding after welding It is difficult for the seam to meet the minimum mechanical performance requirements required by the joint, so it will increase the welding cost, and the operation is difficult, and the probability of arc interruption and welding penetration in the middle is high. Planing and repairing greatly reduce the welding efficiency; 2. During the loading stage of the ship, the joint gap fluctuates greatly. If the thick plate is welded vertically, the welding heat input will also vary greatly, which is very easy to cause The mechanical properties of the joints do not meet the standards; 3. When semi-automatic or automatic CO2 gas shielded welding is used, the number of thick plate welding layers is large, and the welding parameters of each layer are limited to 280A, so the welding efficiency is low; 4. Semi-automatic CO2 gas shielded welding is a manual operation, which requires high skill and responsibility of the welder itself. The number of layers must be arranged reasonably during welding, and the angle or defect generated in the process must be removed before the next welding can be carried out. The welding quality is stable. relatively poor

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