Gas shielded welding technology of steel for Q960 ultrahigh-strength steel structure

A gas shielded welding, ultra-high strength technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of joint performance cannot be guaranteed, no application, lack of experience, etc., to reduce hardenability and sensitivity , Avoid the effect of welding cracks

Inactive Publication Date: 2015-12-16
SHANDONG ZHONGTONG STEEL STRUCTURE ENG
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Problems solved by technology

The conventional steel Q345B has good weldability, and there is generally no cold crack during the welding process; there is still a lack of experience in the welding process of ultra-high-strength steel; if the conventional welding process is used, the performance of the joint after welding will not be guaranteed; The welding of high-strength steel has not yet been applied in the manufacture of steel structures

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  • Gas shielded welding technology of steel for Q960 ultrahigh-strength steel structure

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Embodiment Construction

[0019] The features and principles of the present invention will be described in detail below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, not to limit the protection scope of the present invention.

[0020] The gas-shielded welding process of the Q960 ultra-high-strength steel structural steel is characterized in that the process includes the following steps:

[0021] Pre-treat the steel plate before welding to ensure that there is no oil, moisture, rust, etc. within 50mm of the groove to be welded and both sides of the groove until the metallic luster is exposed, and ensure that there are no cracks, delamination and other defects within the cleaning range.

[0022] The diameter of solid wire welding wire is 1.2mm, and the weight percentage of its chemical composition is: C: 0.08-0.15%, Si: 0.65-0.75%, Mn: 0.75-0.80%, P: ≤0.01%, S: ≤0.008%, Cr: 0.20~0.22%, Ni: 1.25~1.30%, Cu: 0.12~0.18%, Mo: 0.25~0.28%, ...

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Abstract

The invention provides a gas shielded welding technology of steel for a Q960 ultrahigh-strength steel structure. The gas shielded welding technology mainly comprises the steps that a certain weight proportion of welding wires made of alloying elements are adopted, and input quantities such as preheating temperature, voltage, current and welding speed which are matched with the thicknesses of different steel plates are correspondingly set. The quenching degree of a steel plate welding joint is reduced, the plastic deformation capacity of the welding joint is improved, and generation of cracks is reduced.

Description

technical field [0001] The invention relates to the technical field of a welding process for ultra-high-strength steel, in particular to a gas-shielded welding process for Q960 ultra-high-strength steel structural steel. Background technique [0002] With the rapid development of the steel structure industry, reducing the weight of the structure and increasing the bearing capacity will become an inevitable trend in the development of the industry, so more and more ultra-high-strength steel will be applied; welding plays an extremely important role in the production of steel structures. The quality of the weld seam is directly related to the service life of the steel structure. In order to meet the quality requirements and performance of the steel structure and ensure the smooth completion of the project, a huge challenge has been placed on the welding technology of ultra-high-strength steel. As one of the main welding methods in steel structure production, gas shielded weldi...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K35/30B23K35/38B23K9/235B23K9/095B23K33/00
CPCB23K9/164B23K9/095B23K9/235B23K33/00B23K35/3033B23K35/383B23K2103/04
Inventor 陈蒙葛英献冯树国寻知磊胡树青
Owner SHANDONG ZHONGTONG STEEL STRUCTURE ENG
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