Vertical down surfacing welding method capable of realizing aesthetic welding joint and low dilution rate

Abstract

The invention discloses a vertical down surfacing welding method capable of realizing aesthetic welding joint and low dilution rate, wherein an impulse consumable electrode inert gas arc welding source is adopted; a pipe is placed vertically, a welding gun points to an oblique upper direction and forms an included angle of 75 to 80 degrees with the vertical direction, and the electric arc ejected by the welding gun blows to a weld pool; the welding gun performs reciprocated swing horizontally, the swing frequency is 500 to 900 times per minute, and the swing width is 5 to 9mm; the welding current is 120 to 180 A, the welding voltage is 22 to 25V, the wire feed rate is 6 to 8 meters per minute, and elongation of a wielding wire rod is controlled to be 10 to 15mm; the moving down speed of the welding gun is 600 to 1200 millimeters per minute. The vertical down surfacing welding method provided by the invention can enable the welding joint to be continuous and smooth, and thin and aesthetic, and is shallow in depth of fusion and low in dilution rate, the welding wires are saved, and the cost is lowered.

Description

technical field [0001] The invention relates to a vertical downward surfacing welding method with beautiful weld seam and low dilution rate. Background technique [0002] With the transformation of the manufacturing industry from the traditional model of high input, high consumption and high pollution to the sustainable development model of improving production efficiency, maximizing the use of resources, and minimizing waste, surface engineering and remanufacturing engineering have developed rapidly in recent years. develop. Surfacing welding is an important technical means of surface engineering and remanufacturing engineering. The surfacing welding technology has the following characteristics: the surfacing layer and the base metal can achieve metallurgical bonding; the surface layer thickness obtained by surfacing welding is the largest; the equipment used is relatively simple; it is easy to implement on-site construction; and it is relatively mature in technology. The...

AI Technical Summary

Problems solved by technology

However, the appearance of this surfacing method is not beautiful enough, the surfacing weld seam is uneven, the dilution rate can only be controlled at about 10%, the deposition rate is large, and the welding quality is low, which greatly reduces the metallurgical properties of the surfacing layer.

At the same time, due to the high price of materials, the traditional 360-degree surfacing welding method has a large overlap ratio of welds, resulting in a lot of waste of materials

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