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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, arc welding equipment, edge parts of workpieces, etc., to achieve the effects of full objectivity and rationality, good welding efficiency, and good weather resistance

Active Publication Date: 2014-09-17
CHINA RAILWAY SHANQIAO GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] 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.

[0045] Table 1: Chemical Composition of Steel (wt%)

[0046]

[0047] Table 2: Mechanical Properties of Copper

[0048] Plate thickness mm

Rel, MPa

Rm, MPa

A，(％)

Bend 180°

-20℃ Longitudinal KV2(J)

Data Sources

≤16

≥345

≥490

≥20

d=2a intact

≥47

standard

13

350

620

23.0

qualified

98，96，110

retest value

＞16～50

≥345

≥490

≥20

d=3a intact

≥47

standard

25

380

600

32.0

qualified

88，120，96

retest value

＞50

≥335

≥490

≥20

d=3a intact

≥47

standard

57

355

54...

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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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Patent Type & Authority Patents(China)
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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