Laser no-filling penetration weld seal welding process for T-shaped welding head of steel plate

Abstract

The invention discloses a laser no-filling penetration weld seal welding process for a T-shaped welding head of a steel plate. The laser no-filling penetration weld seal welding process comprises the steps as follows: carrying out laser no-filling penetration weld on a weld joint overlapping part of a first workpiece and a second workpiece from the rear surface of the first workpiece by adopting a laser welding machine so as to form a weld joint; carrying out laser no-filling penetration weld in the perpendicular direction of the weld joint for multiple times so as to form a plurality of perpendicular weld joints perpendicular to the weld joint, wherein a gap exists between the adjacent perpendicular weld joints; and carrying out weld joint leak detection on the weld joint, and when a weld joint leak point is found, manually repairing the weld joint between the adjacent perpendicular weld joints in a position where the weld joint leak point is. With the adoption of the laser no-filling penetration weld seal welding process, the phenomenon of welding the whole weld joint is avoided, the difficulty and the workload of manual repair welding are lowered, and the welding deformation of manual repair welding when the whole weld joint is weld is also reduced at the same time, thereby enabling the weld joint to be beautiful.

Description

technical field [0001] The invention relates to a sealing welding process of laser non-filling penetration welding of T-shaped welding joints of steel plates, belonging to the field of welding technology. Background technique [0002] At present, laser welding technology has been widely used in the welding production of steel plates. C02 lasers are often used in thick plate welding, and Nd: YAG lasers are generally used in thin plate welding. This is because the C02 laser has high power and can obtain a large penetration depth, while the YAG laser has low power and cannot output the energy required for thick plate welding. Laser welding can be achieved by continuous or pulsed laser beams. The principle of laser welding can be divided into heat conduction welding and laser deep penetration welding. When the power density is less than 104~105 W / cm2, it is heat conduction welding. At this time, the penetration depth is shallow and the welding speed is slow; when the power den...

AI Technical Summary

Problems solved by technology

Steel plate laser deep penetration welding technology without filling is generally used in butt welding and lap welding of steel plates. It has also been applied to the welding of T-shaped welding joints of steel plates. However, when the weld seam gap is greater than 0.1mm or the laser power is unstable, it will "Blowholes" are formed, causing the penetration welding seam to be unable to be sealed. Leakage points are found. Due to the limitation of welding space, manual repair welding is required. When it is found that the penetration depth is not enough, the entire weld seam must be repaired, and even the weld seams around the two ends must be repaired. , which increases the difficulty and workload of manual repair welding, repair welding the entire weld seam, welding deformation is also large

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