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A gas-shielded welding method for high-strength steel thick plates of 1000mpa engineering machinery

A technology of construction machinery and gas protection, applied in welding equipment, welding medium, welding equipment and other directions, can solve problems such as unfavorable field operation, small thickness of steel plate, low matching, etc., to avoid cold cracks in welding, ensure weld toughness, process simple effect

Active Publication Date: 2018-12-28
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also involves two welding methods and three kinds of welding wires, which is not conducive to on-site operation. The joint strength is 900-980MPa, which is a low match for 1000MPa high-strength steel, which is not conducive to giving full play to the high-strength advantages of high-strength steel.
[0005] All existing welding methods involving 1000MPa-grade high-strength steel plates adopt low-strength matching, which is suitable for small steel plates (basically below 30mm), and the use of welding methods and types of welding materials increases the replacement of welding gases, equipment, and welding wires Frequency, not conducive to on-site actual operation

Method used

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  • A gas-shielded welding method for high-strength steel thick plates of 1000mpa engineering machinery

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Experimental program
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Effect test

Embodiment 1

[0035] A gas-shielded welding method for a 1000MPa grade construction machinery high-strength steel thick plate, the steps of which are:

[0036]1) Welding conditions: mechanical properties of steel plates for construction machinery to be welded: yield strength R el =955MPa, tensile strength R m =1020MPa, Elongation A=17%, Longitudinal -20°C Impact Energy KV 2 =120J, the delivery state is quenched and tempered; the size of the welding test plate is 500mm×150mm×30mm, the joint form is flat butt joint, the welding test equipment is 455 Lincoln welding machine, the ambient temperature is 25ºC, and the humidity is 70%;

[0037] 2) Welding groove form: double-sided V-shaped asymmetric groove, the groove angle is 60º, the blunt edge size is 2.2mm, and the assembly gap is 2mm; the groove is polished and cleaned before welding;

[0038] 3) Matching welding materials: the bottom welding wire is 700MPa solid core gas shielded welding wire; the diameter of the welding wire is 1.2mm; th...

Embodiment 2

[0048] A gas-shielded welding method for a 1000MPa grade construction machinery high-strength steel thick plate, the steps of which are:

[0049] 1) Welding conditions: mechanical properties of steel plates for construction machinery to be welded: yield strength R el =965MPa, tensile strength R m =1070MPa, Elongation A=16%, Longitudinal -20°C Impact Energy KV 2 =110J, the delivery state is quenched and tempered; the size of the welding test plate is 500mm×150mm×40mm, the joint form is flat butt joint, the welding test equipment is 455 Lincoln welding machine, the ambient temperature is 25ºC, and the humidity is 60%;

[0050] 2) Welding groove form: double-sided V-shaped asymmetric groove, the groove angle is 60º, the blunt edge size is 2.5mm, and the assembly gap is 2mm; the groove is polished and cleaned before welding;

[0051] 3) Matching welding materials: the bottom welding wire is 700MPa solid core gas shielded welding wire; the diameter of the welding wire is 1.2mm; t...

Embodiment 3

[0061] A gas-shielded welding method for a 1000MPa grade construction machinery high-strength steel thick plate, the steps of which are:

[0062] 1) Welding conditions: mechanical properties of steel plates for construction machinery to be welded: yield strength R el =960MPa, tensile strength R m =1080MPa, Elongation A=16%, Longitudinal -20°C Impact Energy KV 2 =110J, the delivery state is quenched and tempered; the size of the welding test plate is 500mm×150mm×50mm, the joint form is flat butt joint, the welding test equipment is 455 Lincoln welding machine, the ambient temperature is 25ºC, and the humidity is 70%;

[0063] 2) Welding groove form: a double-sided V-shaped asymmetric groove, the groove angle is 60º, the blunt edge size is 3mm, and the assembly gap is 2mm; the groove is polished and cleaned before welding;

[0064] 3) Matching welding materials: the bottom welding wire is 700MPa solid core gas shielded welding wire; the diameter of the welding wire is 1.2mm; t...

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Abstract

The invention provides a gas protection welding method of 1000 MPa-level engineering machine high-strength steel thick plates. Welding base materials are Rm1000-1100 MPa engineering machine quenched and tempered steel plates in equal-thickness flat plate butt joint, a groove is a double-side V-shaped asymmetric groove, the angle of the groove is 60 degrees, a truncated edge is 2-3 mm long, and an assembly gap is 2 mm wide. According to welding materials, bottoming welding wires are 700 MPa-level solid-core gas-protected welding wires with the diameter of 1.2 mm, and filling and surface covering welding wires are 1000 MPa-level solid-core gas-protected welding wires with the diameter of 1.2 mm. The welding method includes the welding steps that bottoming welding is conducted, filling welding is conducted, surface covering welding is conducted, slow cooling is conducted after welding, and joint areas in the range of 300 mm on the two sides of a weld joint are covered with asbestos cloth. Preheating is not needed, after-heating is not conducted, strength and toughness of a joint are ensured, the variety of welding gas and replacement frequency of equipment and the welding wires are reduced, the high-strength advantage of high-strength steel can be fully achieved, and maneuverability is high.

Description

technical field [0001] The invention relates to a gas-shielded welding method for steel plates, in particular to an argon-enriched gas-shielded welding method for engineering machinery low-alloy high-strength steel thick plates with a tensile strength of 1000 MPa. Background technique [0002] In the manufacture of the main structure of mechanical equipment, the selection of high-strength grades instead of low-grade steel plates is of great importance for improving the capabilities and efficiency of equipment, prolonging service life, reducing equipment weight, reducing energy consumption, facilitating installation and transportation, and improving the overall performance of mechanical equipment. effect. In the 1990s, the high-strength steel required in China was around 600MPa, but by the beginning of this century, 600MPa-900MPa high-strength steel had been used on a large scale. At present, the domestic demand for ultra-high-strength steel of 1000MPa grade and above has in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K33/00B23K35/30B23K35/38
CPCB23K9/16B23K33/004B23K35/0261B23K35/3073B23K35/383B23K2101/185B23K2103/04
Inventor 郑江鹏黄治军牟文广刘文艳陈浮方要治钟如涛杜明
Owner 武汉钢铁有限公司
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