Welding method for micro-plasma arc welding of pure titanium foil

Abstract

The invention discloses a welding method for micro-plasma arc welding of a pure titanium foil, in particular the welding of the pure titanium foil of which the titanium content is over 99 percent and the thickness is of 0.05 mm, and relates to the technical field of welding. The method comprises the following steps of: cutting the pure titanium foil to be welded into required sizes; selecting two pure titanium foils (4) and (7), and removing oil stains at the peripheries of the sides to be welded thereof; assembling the two pure titanium foils between fixtures of a tooling system; lapping the sides to be welded for about 0.1 to 0.2 mm so as to ensure a welding seam on grooves (6) of base plates of the fixtures; driving a welding torch to move along the welding seam (9) above the welding seam by a motor on the tooling system; and adopting a pulse current for welding. The welding method for the micro-plasma arc welding of the pure titanium foil realizes the butt welding of the micro-plasma arc welding of the pure titanium foil of 0.05 mm, solves the problems of the deformation and burning of the welding of the pure titanium, saves welding cost without adding a filling metal in the welding seam, is favorable for industrial popularization, and fills the blank of the micro-plasma arc welding in the field of pure titanium foils.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a microbeam plasma arc welding method of pure titanium foil. Background technique [0002] Due to its special corrosion resistance and mechanical properties, titanium has been widely used in machinery and equipment in the aerospace, chemical and pharmaceutical industries. The biggest feature of titanium material is high specific strength, good high and low temperature performance, and excellent corrosion resistance in seawater and most acid, alkali and salt media. In industrial production, the demand for pure titanium foil (ultra-thin pure titanium plate with a thickness of less than 0.1mm) is increasing, so the welding of pure titanium foil is also becoming more and more important. [0003] Compared with the welding of pure titanium foil and other metal materials, there are the following welding difficulties: [0004] 1. The special weldability of titanium. Titanium is an act...

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Problems solved by technology

[0005] 2. Difficulties in the welding process of pure titanium foil

This causes inconsistencies in the conditions of the front and rear weld seams, which increases the difficulty of welding

(2) easy to burn through

During the welding process, if there is poor heat dissipation locally, there will be a burn-through phenomenon at this position, which will seriously affect the quality of the weld

(3) Difficult docking assembly

For 0.05mm titanium foil, if the butt joint assembly is to be strictly performed, in addition to high requirements on the assembly accuracy of the tooling system, manual careful adjustment is also required

(4) The material composition of pure titanium foil determines that it is a soft material, and the operability of soft materials is poor, and its operations include blanking, assembly, pressing and fixing, etc., precisely because of the poor operability of these processes , so quite high requirements are placed on their accuracy, otherwise it will cause artificial welding defects

From the search results, it can be seen that the micro-beam plasma arc welding of pure titanium sheets with a thickness of 0.6 mm or less has not been reported yet.

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