In situ self-spread welding repair method of aluminum mother plate

Abstract

The invention relates to a welding repairing method for aluminum parent metal, in particular to an in-situ self-propagting welding repairing method for aluminum parent metal. The method is characterized in that: self-propagting medical preparation is firstly prepared, and cleaning, oil removal, oxide film removal are carried out on parts to be welded of aluminum parent metal, then welding fluid is coated on a groove face; according to the shape and size of the groove, a mould with lower holes is made by graphite and is fixed on the upper part of the groove, and a graphite plate is clamped at the two sides of the groove by a clamping device and forms a melting chamber together with the mould, an automatic fusible plug is laid at the bottom part of the mould, then the self-propagting medical preparation is poured into the mould, pyrophoric powder is coated above the self-propagting medical preparation, after the parent metal is preheated to a certain temperature, the pyrophoric powders is lighted, thus realizing in-situ self-propagting welding repairing of the aluminum parent metal. By the method provided by the invention, intense magnetic field interference can be avoided, welding quality can be improved, labor intensity can be relieved, and the operation is easy and rapid.

Description

technical field [0001] The invention relates to a welding repair method for an aluminum base material, in particular to an in-situ self-propagating welding repair method for an aluminum base material. Background technique [0002] In recent years, my country's aluminum industry has developed rapidly, and the output of electrolytic aluminum ranks first in the world. Aluminum production technology has reached or approached the world's advanced level in many aspects. In the production of electrolytic aluminum, in order to increase the output of aluminum, the current intensity of the aluminum electrolytic cell is on the rise. At present, the current intensity of the domestic aluminum electrolytic cell has reached 350KA. Such a large DC current produces a strong magnetic field with a diameter of several meters in the electrolytic cell and its surroundings, and the magnetic field strength is calculated to reach 180 Gauss. Aluminum busbars are often accidentally damaged during pro...

AI Technical Summary

Problems solved by technology

Aluminum busbars are often accidentally damaged during production. There are currently two main methods for welding aluminum busbars: one is welding with gas welding, but this welding method is only suitable for welding thin plates, and the efficiency is low, which has limitations in practical applications. It can only be used for partial repair of aluminum soft strip; the other is to use carbon arc welding after current reduction or power failure

Reduced current welding is still affected by the magnetic field; short-term power outages not only reduce the output of electrolytic aluminum and greatly increase energy consumption, but also increase harmful gas emissions and cause environmental pollution. Although the backward carbon arc welding method is relatively fast, the joint If the quality is poor, the strength and conductivity of the joint will be affected; when the electrolyzer is powered off for a long time or intermittently, due to thermal expansion and contraction, even if certain insulation measures are taken, it will also affect the lining of the electrolytic tank

Some other welding methods, such as molten tungsten argon arc welding under magnetic field shielding, casting welding, and laser welding, all have the above-mentioned shortcomings and are difficult to popularize and apply.