A welding process of austenitic medium-manganese wear-resistant steel with gas shielded gas shielded welding
A technology of molten electrode gas and welding process, which is applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of extended production cycle, high cost, and large deformation of manual arc welding, so as to improve production efficiency and save energy Effect
Active Publication Date: 2017-10-20
TIANJIN WILL LONG SCI &TECH CO LTD
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Problems solved by technology
[0004] As far as the existing technology is concerned, the domestic patent "Welding Process of Wear-resistant Steel and Low Carbon Steel Dissimilar Metal Gas Shielded Metal Welding" (publication number CN104625352A) discloses a kind of gas shielded welding of high manganese wear-resistant steel and low carbon steel. Welding process, the welding material needs to be preheated before welding, and heat treatment is required after welding, which increases the complexity of the welding process
The domestic patent "Welding Method for Gas Metal Arc Welding" (publication number CN104308335A) discloses a welding method for gas metal arc welding. Although it solves the problems of large deformation, low efficiency and high cost of manual arc welding, there are still problems before welding. It is necessary to preheat the welded parts, which increases the production cost and prolongs the production cycle
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[0019] 1. Material and parameter selection
[0020] The base material is BTW1 austenitic medium manganese wear-resistant steel, and the welding material is φ1.2mm welding wire. ≤0.02%, Si: 0.70-1.00%, Cr: 17.00-19.00%, Mo≤0.10%, V≤0.10%, and the rest are iron and unavoidable impurities. The mechanical properties of BTW1 base metal are shown in Table 1.
[0021] Table 1 Mechanical properties of BTW1 austenitic medium manganese steel
[0022]
[0023] The base metal of the welding test adopts double V-shaped openings, the opening angle is 60°, and the groove depth is 18mm; the shielding gas is 95% Ar+5% CO 2 , the gas flow rate is 15-20L / min; when rooting welding, the current is 150-180A, the voltage is 20-24V, the welding speed is 20-30cm / min, and the heat input is ≤10.0KJ / cm; when filling welding, the current is 190-230A, voltage 24-26V, welding speed 30-40cm / min, heat input ≤12.0KJ / cm; process parameters of cover welding are the same as those of filling welding. The we...
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Abstract
The invention provides a gas metal arc welding process for austenite medium-manganese wear-resistant steel. The quality of a welded joint is guaranteed by adjusting the welding speed and the interpass temperature and controlling the heat input quantity. The gas metal arc welding process has the advantages that base metal does not need to be preheated before welding, and welding lines do not need to undergo stress relief annealing after welding; the tensile strength of the obtained welded joint is greater than or equal to 750 MPa, tensile failure occurs on the base metal of the austenite medium-manganese steel, the impact toughness of the welding line zone is greater than 105 J, and the welded joint is qualified in the bending test with the bending diameter being 16 d and the bending center angle being 180 degrees. By adopting the welding process, the good welded joint can be obtained, the energy can be saved, and the production efficiency can be improved.
Description
technical field [0001] The invention belongs to the technical field of gas-shielded gas-shielded welding welding technology for wear-resistant steel, and in particular relates to a gas-shielded gas-shielded welding technology for austenitic medium-manganese wear-resistant steel. Background technique [0002] Medium manganese steel is an anti-wear material developed on the basis of high manganese steel. Under medium and low impact loads, deformation-induced martensitic phase transformation occurs on the surface of the steel, resulting in work hardening, which makes the surface of the workpiece wear-resistant. The toughness is improved, but the core still maintains high toughness, showing the comprehensive mechanical properties of surface hardness and toughness. The application of medium manganese wear-resistant steel in mining machinery and equipment mostly exists in the form of welded parts. As a new type of austenitic wear-resistant steel, the research on its welding perfor...
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IPC IPC(8): B23K9/173
CPCB23K9/173
Inventor 王军祥岳宏霖范桂霞高继萍王斐牛广义
Owner TIANJIN WILL LONG SCI &TECH CO LTD