Dual-MAG heat source dual-filament submerged arc build-up welding method

A submerged arc surfacing and thin wire technology, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of high labor intensity of welders, difficult control of process parameters, waste of repair costs, etc., and reduce the repair rate of weld seams. , Avoid the influence of welder skills and reduce the effect of flux loss

CN111496346AInactive Publication Date: 2020-08-07HARBIN ELECTRIC MASCH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-08-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a dual-MAG heat source dual-filament submerged arc build-up welding method which aims to solve the problems such as gas holes in aluminum bronze MAG build-up welding, incomplete fusion, slag inclusion, welder poisoning caused by copper welding smoke gas, and the like. The dual-MAG heat source dual-filament submerged arc build-up welding method comprises the following steps:I, removing spray nozzles for dual welding guns connected to a dual-MAG power supply, adopting dual conductive nozzles to separately clamp dual welding wires, embedding protective soldering flux, andadopting direct-current reverse connection for the dual-MAG power supply; II, enabling the dual welding guns to simultaneously arc and feed wires, enabling end parts of dual wires to define an included angle to advance side by side, and enabling two electric arcs to define a congruent melting tank; III, regulating current of the dual-MAG power supply to be 160A-200A, enabling voltage to be 24V-28V, enabling welding speed to be 30 cm / min to 40cm / min, enabling offset of adjacent two welding beads to be 1 / 3-1 / 2 of width of an upper welding seam (7), performing build-up welding on 3-4 wear-resisting layers, and enabling the thickness of a bottoming layer to be not greater than 3 mm. The welding method disclosed by the invention can be applied to the field of aluminum bronze build-up welding engineering of a water turbine.
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Description

technical field

[0001] The invention relates to the field of submerged arc welding, in particular to a method for submerged arc surfacing welding with double MAG heat sources and double filaments. Background technique

[0002] Ball valves and upstream and downstream flanges of large pumped-storage turbines, due to the repetitive reciprocating movement during the operation of the unit, need to surfacing wear-resistant aluminum bronze layer on the low alloy steel or carbon steel side of the friction contact surface, so as to improve the performance of the workpiece , improve the service life, save more expensive copper alloy materials and reduce costs. The remaining thickness of the aluminum bronze surfacing layer after processing is generally 6mm-8mm, and in order to ensure the alloy composition and performance of the cladding layer, the surfacing thickness is generally required to be more than 10mm. In production, MIG welding is often used for aluminum bronze surfacing weld...

Examples

Embodiment Construction

[0021] The invention provides a double MAG heat source double filament submerged arc surfacing welding method. Technical scheme of the present invention is:

[0022] 1) Cleaning before welding: Grinding to remove oxides on the surface of the workpiece 1 to be welded, exposing the metallic luster, and the workpiece 1 to be welded does not need to be preheated;

[0023] 2) Welding material preparation: the first welding wire 4 and the second welding wire 6 are aluminum bronze welding wires with a diameter of 1.2mm and the model is AWS ERCuAl-A2, and the protective flux 2 is the melting flux of the model HJ260, and the particle size of the flux is 8 mesh to 25 At present, the drying temperature before welding is 350°C, the drying time is 2 hours, and no protective gas is needed;

[0024] 3) Welding machine preparation: Two MAG welding machines of the OTC brand CPVM500 type of welding power source are used, and the two power sources are DC reversed;

[0025] 4) Welding torch pre...