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Welding method for Q345qDNH weather-resisting steel for bridge

A welding method and technology of weathering steel, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., to achieve the effect of strong practicability, strong applicability and good weather resistance

Active Publication Date: 2012-12-26
CHINA RAILWAY SHANQIAO GRP CO LTD
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Problems solved by technology

The existing bridge steel welding methods at home and abroad do not involve the welding of Q345qDNH weathering steel. The use of Q345qDNH weathering steel in bridge steel structure conforms to the development direction of steel bridges. The welding method involved is the key technology to ensure the quality of bridge construction and needs to be carried out. new research and exploration

Method used

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  • Welding method for Q345qDNH weather-resisting steel for bridge
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  • Welding method for Q345qDNH weather-resisting steel for bridge

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Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] The chemical composition of the bridge Q345qDNH weathering steel involved in the present invention is listed in Table 1, and the mechanical properties are listed in Table 2.

[0046]

[0047]

[0048] According to different plate thicknesses B of Q345qDNH weathering steel used in bridges, the present invention determines the preheating temperature before welding as follows: when the plate thickness B≤20mm, no preheating is required before welding; Heat at 20-60°C; when the plate thickness B is 30-70mm, preheat at 65-110°C before welding.

[0049] The welding input energy of the present invention: the control range of the welding input energy of the welding heat-affected zone -20°C Charpy impact energy KV2 ≥ 47J is: ≤ 50kJ / cm.

[0050] The present invention aims at the different plate thicknesses B of Q345qDNH weathering ...

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Abstract

The invention discloses a welding method for Q345qDNH weather-resisting steel for a bridge. According to the welding method provided by the invention, specific to the special chemical components, suitable technical conditions and different slab thickness of the Q345qDNH weather-resisting steel for the bridge, a welded joint is jointed in a butt-jointed or T-shaped corner jointed form. According to the welding method, submerged-arc welding, drug core CO2 gas shielding semi-automatic welding or shielded metal arc welding is adopted and the weld preheating temperature is confirmed according to the different slab thickness. According to the welding method provided by the invention, the joint form and the thickness size of a bridge structure are completely covered; the technical scheme is simple and the applicability is strong; the implementing effect meets the technical demands of the present related standard for the construction of the bridge steel and the bridge structure; and the welding method can be practically applied to the welding of the Q345qDNH weather-resisting steel bridge structure.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material welding, in particular to a welding method of Q345qDNH weathering steel for bridges. Background technique [0002] Weathering steel, that is, atmospheric corrosion-resistant steel, is a low-alloy steel series between ordinary steel and stainless steel. It is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper, nickel, chromium, and titanium. It has the toughness of high-quality steel , plastic extension, corrosion resistance and other characteristics. At present, the substantial improvement of my country's railway and highway transportation capacity requires the continuous expansion of the construction scale of railway and highway bridges. Weathering steel for bridges will be a development trend. Using its rust resistance, the components have corrosion resistance and prolong service life. Long life, free from painting, environmental prot...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/16B23K9/18B23K33/00B23K103/04
Inventor 徐向军贝玉成范军旗单亚廷刘壮刘振刚曹磊刘洪柱陈英杰马立鹏
Owner CHINA RAILWAY SHANQIAO GRP CO LTD
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