Multi-electrode welding device and method for metal shielding layer of submarine cable

Abstract

The invention relates to a multi-electrode welding device for a metal shielding layer of a submarine cable. The multi-electrode welding device for the metal shielding layer of the submarine cable comprises a mounting disc, a central electrode assembly vertically arranged in the centre of the mounting disc, and side electrode assemblies which are annularly distributed in an array around the centralelectrode assembly; an electrode drift angle adjustment mechanism is arranged between the side electrode assemblies and the mounting disc; and the side electrode assemblies and the central electrodeassembly are of the same structures and are all provided with an electrode height adjustment up-down mechanism. According to the multi-electrode welding device for the metal shielding layer for the submarine cable, the arc stability is improved and the welding accident risk is reduced through combined work of a plurality of electrode assemblies; a plurality of electrodes shunt current, so that thetemperature of the electrodes is reduced, the burning rate of a tungsten needle is reduced, the continuous use time of the tungsten needle is greatly improved, the production capacity is improved, and the continuous service life of the electrodes can be prolonged by 4 to 6 times compared with a single gun welding system; and a metallurgical reaction of a molten pool is improved through welding preheating, so that the quality of a welding seam is improved, and the quality of the submarine cable is ensured. The focusing degree of the plurality of the electrode assemblies can be adjusted freelyso as to obtain the best welding manufacturability.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a multi-electrode welding device and method for a submarine cable metal shielding layer. Background technique [0002] The shielding layer of conventional submarine cables plays the role of anti-signal interference, improving electric field distribution, fastening structure, etc. The longitudinal seam connection method after the metal shielding layer is formed is generally TIG welding. The forming and welding methods of the common metal shielding layer in the submarine cable field are: after the metal strip is longitudinally wrapped, it is welded by Tig welding with a single electrode without filler wire. Limited by the welding method, the electrode continues to discharge under the action of the current. The tungsten needle The electrode is always in a high-temperature state. After long-term use, the needle is prone to ablation, which will cause arc dispersion, welding energy is...

AI Technical Summary

Problems solved by technology

It has the following defects: ①The stability of the single-electrode welding system is poor, and the tolerance of unfavorable factors is poor: once there are unstable factors such as welding material contamination, needle tip ablation and peeling off, the arc quality will be significantly affected, often resulting in virtual welding, Unfavorable effects on product quality, such as lack of fusion and missing welding, bring direct economic losses and hidden dangers of product failure

②Single-electrode welding has limited current-carrying capacity: as the line speed increases, the tungsten needle carries a larger current and higher temperature, and the tungsten needle burns faster, causing arc instability, which in turn affects the stable use time of the electrode, so the single-electrode The continuous welding time of TIG welding is often very short

③Insufficient metallurgical reaction of single-electrode welding seam and poor quality of weld seam

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