A high heat input gas-electric vertical welding gas-shielded flux-cored wire based on grain refinement mechanism
A flux-cored wire, high heat input technology, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problem of limited welding heat input range, increasing the hardening tendency of weld metal, and increasing the degree of burning of beneficial alloying elements. Advanced problems, to achieve the effect of improving welding process performance, ensuring comprehensive mechanical properties, and ensuring the quality of weld forming
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[0072] The present invention will be further described below in conjunction with embodiment.
[0073] See Table 1 for the chemical composition of the flux-cored welding wire steel strip of the present invention. Table 2 shows the composition of the flux-cored wire powder of the present invention, the balance of which is reduced iron powder.
[0074] Table 3 shows the chemical composition of the cladding metal in the examples of flux-cored wires designed with five different compositions.
[0075] In the embodiment of the present invention, EH40 grade shipbuilding steel with a wall thickness of 35 mm was selected to conduct a gas-electric vertical welding test with a heat input of about 230 kJ / cm. The welding current is 390-430A, the welding voltage is 40-42V, and the welding speed is 4.2-4.6mm / min. Welding adopts V-shaped groove without blunt edge, the groove angle is 30°±2°, the pair gap is 5-8mm, and the corresponding front opening width is 23-26mm. During the welding proces...
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