Auxiliary wire feeding process and device for submerged-arc welding

Abstract

The invention relates to an auxiliary wire feeding process and device for submerged-arc welding. Welding wires drawn out of a wire reel enters the auxiliary wire feeding device and is fed to a wire feeder after the conveying speed is adjusted through a wire pressing wheel set in the auxiliary wire feeding device, and a certain amount of stock of the welding wires is ensured to be reserved between the auxiliary wire feeding device and the wire feeder, namely the welding wires are continuously conveyed in an arc-shaped state between the two devices. The pressing force can be automatically compensated and adjusted through upper wire pressing wheels of the wire pressing wheel set, so that the traction of the welding wires in the conveying process is kept to be constant and it is ensured that the welding wires are not damaged. According to the auxiliary wire feeding process and device for the submerged-arc welding, the auxiliary wire feeding device are flexibly connected between the wire feeder and the wire reel, and the wire feeding speed can be adjusted automatically, so that the precision and stability of the wire feeding are effectively improved. The locating positions of the wire feeder and the wire reel are more flexible, and the coil weight of the welding wires of the wire reel can be increased, so that the replacing times of the welding wires is reduced and the efficiency is improved. The pressure of pressing wheels of the wire feeder is reduced, and the damage to the welding wires can be avoided.

Description

technical field [0001] The invention relates to a submerged arc welding welding wire continuous conveying system, in particular to an auxiliary wire feeding process and device for submerged arc welding. Background technique [0002] At present, the submerged arc automatic welding method is widely used in the manufacturing process of spiral welded pipes. In order to improve the weld quality and production efficiency, the internal welding and external welding multi-wire welding processes are generally used. The welding wire conveying system of each welding wire is generally composed of a welding wire reel and a wire feeder. The development trend of the process is: 1) In order to reduce the number of times of changing welding wire, the weight of each welding wire is getting larger and larger, even reaching more than 400Kg; 2) In multi-wire In the submerged arc welding process, 2-6 wire feeders should be placed at the same time. For welding inside the steel pipe, the space is ve...

AI Technical Summary

Problems solved by technology

These new trends make the existing wire feeding process system unable to meet the requirements

[0003] The existing welding wire feeding process system has the following problems: 1) The design of the wire feeding machine is a fast response system, and the wire feeding speed needs to be adjusted quickly, so that the welding process should be kept stable and meet the specification requirements, and the large welding wire coil weight is not conducive to rapid adjustment ;2) The distance between the wire feeder and the wire reel is long, the middle welding wire is sometimes tense and sometimes loose, the wire reel is almost in an intermittent operation state, and the operation state is unstable; 3) In order to improve the driving force of the wire feeder and avoid the welding wire slipping Increase the pressure of the wire feeding roller, resulting in deep tooth marks on the surface of the welding wire, which will cause aggravated wear of the welding tip; the scratches will cause the coating on the surface of the welding wire to fall off, blocking the welding tip; the formation of tooth marks will greatly increase the contact area between the welding wire and the conductive tip 4) The installation of the wire feeder and welding tip system is not completely rigid, and the pulling force of the welding wire on the wire feeding machine gun nozzle system changes periodically, making the position of the welding tip unstable, and the height change affects the welding specification , level changes affect the weld bead shape

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