Gas shielded arc welding method for high intensity bridge heavy plate K type joint

A welding method and high-strength technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problem that the impact energy of deposited metal and the actual joint toughness cannot meet the welding technical requirements, the impact energy cannot meet the requirements, and the toughness index is too different To solve problems such as distance, achieve the effect of excellent welding process performance, high impact toughness reserve and safety margin, and excellent crack resistance
CN101549429AInactive Publication Date: 2009-10-07武钢集团有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
武钢集团有限公司
Publication Date
2009-10-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention discloses a gas shielded arc welding method for high intensity bridge heavy plate K type joint which welds wide span high intensity bridge steel K type joint with perfect weld joint property, and does not need pre-warming and post heat-treated. The method is that: using Rm: 570-650 MPa, Rel: 420-490MPa, A:18-24%, -40 deg c A(KV): 120-270J bridge steel with thickness 36-50mm; a matching welding wire Rm: more than 600MPa, the welding wire diameter 1.2mm; a gas shielded arc welding bevel angle is two-sided k type symmetrical, the bevel angle 50-55 degree, blunted edge 2mm; wealthy argon is used as protective gas and flow quality is 18-20 L / min for welding continuously in condition of current 260-250A, voltage 23-22V, welding speed 29-20cm / min and welding weld line energy 12-17 kj / cm for filling the weld joint, an interlayer temperature is controlled between 100-150 deg c.
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Description

technical field

[0001] The invention relates to a gas-shielded welding method for high-strength bridge steel, especially suitable for tensile strength R m A gas-shielded welding method for K-type joints of long-span bridge structures manufactured from 570-650MPa low-alloy high-strength bridge steel. Background technique

[0002] As the overall design of the bridge gradually develops towards high strength, long span, heavy load and high speed. In order to meet the requirements of the development of bridge construction in my country, Wuhan Iron and Steel (Group) Company has developed 14MnNbq, WNQ570, WNQ690 and other high-strength, high-toughness bridge steels, whose comprehensive mechanical properties have reached the level of similar foreign steels, especially low-temperature impact Toughness has been greatly improved. The improvement of the performance of the base material puts forward urgent requirements for matching welding materials and welding processes. Due to the in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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