900MPa high-strength steel preheating-free combined welding method

A welding method, 900mpa technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as difficulty in achieving tensile strength welding, and achieve crack resistance and comprehensive mechanical properties, low production costs, and applicability strong effect

Inactive Publication Date: 2010-06-16
SHANDONG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve welding of high-strength steel with a tensile strength of 900MPa using this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Butt welding of 900MPa low-carbon quenched and tempered high-strength steel with a thickness of 20mm. Using electrode arc welding and Ar+CO 2 Mixed gas arc welding (MAG) for welding, Ar and CO 2 The gas volume ratio is 90%:10%.

[0026] (1) Welding equipment and welding materials

[0027] The welding equipment adopts the inverter welding machine with good dynamic characteristics; the electrode arc welding adopts the alkaline low-hydrogen type high-toughness electrode E7015-Ni with a diameter of 3.2mm, and the gas shielded welding adopts a 900MPa solid core wire with a diameter of 1.2mm for filler welding and a diameter of 2.0 mm 800MPa flux-cored wire for cover welding, remove oil, rust and other dirt on the surface of the wire before welding.

[0028] (2) Preparation before welding

[0029] For the joints of low carbon quenched and tempered steel with a thickness of 20mm, a V-shaped bevel is made by grinding with a grinding wheel, the bevel angle is 35°, and the bl...

Embodiment 2

[0039] HQ100 low-alloy high-strength steel with a thickness of 25mm, a box-shaped T-shaped joint, and a bottom plate with a size of 300mm×300mm×25mm. Using electrode arc welding and Ar+CO 2 Mixed gas shielded welding method, in which Ar and CO 2 The gas volume ratio is 95%:5%.

[0040] (1) Welding equipment and welding materials

[0041] The welding equipment adopts the inverter welding machine with good dynamic characteristics; the electrode arc welding adopts the alkaline low-hydrogen type high-toughness electrode E7515-Ni with a diameter of 3.2mm, and the gas shielded welding adopts a 900MPa solid core wire with a diameter of 1.2mm for filler welding and a diameter of 2.0 mm 800MPa flux-cored wire for cover welding, remove oil, rust and other dirt on the surface of the wire before welding.

[0042] (2) Preparation before welding

[0043] For the low-carbon quenched and tempered steel with a thickness of 25mm, the V-shaped groove is made by machining. Only the vertical p...

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Abstract

The invention discloses a 900MPa high-strength steel preheating-free combined welding method. 700-800 MPa low-hydrogen type high-tenacity shielded metal arc welding is adopted for backing welding, then a 900MPa high-tenacity solid wire is matched with Ar+CO2 mixed gas shielded welding for implementing filling welding, and a 800MPa flux-cored wire is matched with CO2 gas shielded welding for cosmetic welding. A crack-free welding joint can be obtained by welding 900MPa high-strength steel through adopting a preheating-free and postweld heat treatment free combined welding process, and a joint region is smooth and clean, and can meet operating requirements on a high-strength steel welding structure for higher bearing capacity because the room temperature tensile strength of weld metal is more than 860MPa and the damping power of a V-shaped notch of the weld metal with the test temperature of 0 DEG C is more than 90J; and meanwhile, the method has welding cost reduced by about 25 percent, simple and convenient operation and easy popularization.

Description

technical field [0001] The invention relates to a non-preheating welding method for high-strength steel, in particular to a combined welding method for 900MPa low-alloy high-strength steel without preheating and post-weld heat treatment, and belongs to the field of welding technology. Background technique [0002] Low-alloy quenched and tempered high-strength steel is widely used in construction machinery, electric power, pressure vessels, mining machinery and other manufacturing fields due to its high strength and good ductility, and welding is a crucial factor affecting the application of low-alloy quenched and tempered high-strength steel. In particular, the engineering application of low-alloy high-strength steel with a tensile strength of 900MPa puts forward higher requirements for welding methods, welding materials and processes. [0003] The high-strength steel with a tensile strength of 900MPa has a complex alloy system, high hardenability, and a clear tendency to co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23K9/00B23K9/16
Inventor 李亚江王娟蒋庆磊
Owner SHANDONG UNIV
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