A multi-electrode welding device and method for a submarine cable metal shielding layer

Abstract

The invention relates to a multi-electrode welding device for the metal shielding layer of a submarine cable, comprising a mounting plate, a central electrode assembly vertically arranged in the center of the mounting plate, side electrode assemblies distributed in a circular array around the central electrode assembly, and the connection between the side electrode assembly and the mounting plate There is an electrode deflection adjustment mechanism between them, and the side electrode assembly and the center electrode assembly have the same structure and are equipped with an electrode height adjustment mechanism. The invention works together through multiple electrode assemblies to improve arc stability and reduce the risk of welding accidents; multi-electrode shunting reduces electrode temperature, reduces the burning rate of tungsten needles, greatly increases the continuous use time of tungsten needles, and improves production capacity. With the gun welding system, the continuous working life of the electrode can be increased by 4~6 times; the metallurgical reaction of the molten pool can be improved through welding preheating, the quality of the weld can be improved, and the quality of the submarine cable can be guaranteed. The degree of focus of the multi-electrode assembly can be adjusted freely to obtain the best welding processability.

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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