A preparation method of a deep narrow gap melting electrode gas shielded welding contact tip

Abstract

The invention discloses a preparation method of a deep and narrow gap melting electrode gas shielded welding contact tip. The copper contact tip is used as the base body; the copper contact tip is treated with a solvent method by hot dip aluminum plating, so that the surface of the copper contact tip is plated with an aluminum layer; In the electrolyte, the aluminum layer of the copper contact tip is micro-arc oxidized to obtain a welding contact tip with a high temperature resistant and insulating ceramic coating on the outer layer. The film layer of the contact tip of the invention has the advantages of thin thickness, high resistivity, good wear resistance and high temperature resistance, breaks through the size limitation of the insulation treatment of the traditional narrow gap melting electrode gas shielded welding contact tip, and can be applied to deep and narrow gap slopes Welding of mouth joints to improve welding efficiency.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for preparing a conductive tip for gas-shielded welding with a deep narrow gap. Background technique [0002] Narrow gap welding has been successfully applied in some large and important structures, such as high-speed train body, thick-walled pressure vessel, boiler, large mechanical equipment, marine structure, ship hull construction and pressure pipeline, etc. Traditional MIG welding has large heat input and high cost. Narrow gap welding reduces the amount of filler metal and reduces costs; the welding heat input is low, and the mechanical properties of the weld are good; the deformation is small and easy to control. [0003] When welding in a deep and narrow groove, it is often necessary to penetrate the front end of the welding wire into the groove. The function of the contact tip is to ensure the straightness of the welding wire and generate an arc at ...

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Problems solved by technology

It can be seen that the above-mentioned patent mainly obtains Al by thermal spraying on the one hand. 2 o 3 Coating, however copper contact tip has good thermal conductivity, thermal sprayed Al 2 o 3 The coating is more difficult, and the bonding force between the coating and the copper substrate is small, and it is prone to local peeling or cracking, which has a certain impact on the welding stability; on the other hand, the contact tip is insulated by adding a ceramic shell to the surface of the contact tip. However, the insulating layer of this method is too thick, and the size of the electrode is increased, resulting in an increase in the width of the groove, which is not conducive to deep and narrow gap groove welding

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