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High-strength steel plate steel pipe pile butt joint circumferential weld welding method

A high-strength steel plate and welding method technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of not giving groove size, welding preheating welding sequence, welding material weld seam hammering, weld seam heat treatment technology Measures, can not effectively prevent cold cracks and other problems, to achieve the effect of improving the pass rate of flaw detection, avoiding welding cold cracks, and ensuring the quality of welds

Pending Publication Date: 2022-04-05
CHINA RAILWAY SHANQIAO GRP CO LTD
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  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned welding patent is not applicable to the welding of butt girth welds of 500MPa extra-thick composite steel sheet steel pipe piles. At the same time, the specific groove size, welding preheating, welding sequence, Welding materials, weld seam hammering, weld seam heat treatment and technical measures to be taken in welding manufacturing cannot effectively prevent the occurrence of cold cracks

Method used

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  • High-strength steel plate steel pipe pile butt joint circumferential weld welding method
  • High-strength steel plate steel pipe pile butt joint circumferential weld welding method
  • High-strength steel plate steel pipe pile butt joint circumferential weld welding method

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Embodiment

[0034] An embodiment of the present invention provides a high-strength steel sheet steel pipe pile butt girth welding method, the method may include:

[0035] Before welding, polish the groove surface and the 20-30 mm on both sides of the weld to expose the metallic luster. Set an X-shaped groove on the opposite end face of the butt girth weld of the 500MPa extra-thick steel plate 1 steel pipe pile; the depth L1 of the inner groove 11 located on the inner side of the steel pipe pile is greater than the outer groove located on the outer side of the steel pipe pile 12 Depth L2, so that the X-shaped groove forms an asymmetric form in the inner and outer direction of the steel pipe pile; the groove angle θ of the X-shaped groove is 35-40°, and the root gap a is 0-3 mm; further, the ratio of the inner groove depth L1 to the outer groove depth L2 is 11:7.

[0036] The steel pipe pile is preheated before welding, and the preheating temperature is 150-200°C; specifically, the steel p...

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Abstract

The invention discloses a welding method for butt-joint circumferential welds of high-strength steel plate steel pipe piles. The method comprises the steps that X-shaped grooves are formed in the opposite end faces of the butt-joint circumferential welds of 500 MPa-grade super-thick steel plate steel pipe piles; the X-shaped grooves form an asymmetric form in the inner and outer directions of the steel pipe pile; the groove angle of the X-shaped groove ranges from 35 degrees to 40 degrees, and the root gap ranges from 0 mm to 3 mm. The steel pipe pile is preheated before welding, and the preheating temperature ranges from 150 DEG C to 200 DEG C; and the X-shaped groove is fully filled in an inner and outer layered alternate welding mode. According to the method, a reasonable groove form, multiple welding methods, multiple welding materials, a reasonable welding sequence, a hammering stress relief method and a welding seam heat treatment dehydrogenation method are combined, it is ensured that the mechanical property of a welding seam area and the corrosion resistance of a stainless steel side welding seam are matched with base metal, welding cold cracks and other defects can be avoided, the flaw detection qualification rate is increased, and the production cost is reduced. And the welding quality is ensured.

Description

technical field [0001] The invention relates to the technical field of bridge steel structure manufacturing, in particular to a welding method for butt girth welds of high-strength steel sheet steel pipe piles. Background technique [0002] Modern bridge structures are developing in the direction of large span, heavy load, and long life. my country is also increasingly using 500MPa high-strength steel in bridge construction. For example, the Hutong Yangtze River Bridge used Q500qE high-performance bridge steel for the first time, with a maximum plate thickness of 65mm; the Wuhu Second Yangtze River Bridge and Changtai Yangtze River Bridge also used 500MPa high-strength steel, with a maximum plate thickness of 64mm. [0003] The Anjiazhuang Super Bridge on National Highway 109 New Line Expressway uses Q500MD (90mm) + S13603 (4mm) composite steel sheet steel pipe piles with a diameter of 3.4m. This is the first time in China that Q500MPa grade high strength and extra thick Co...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/235B23K9/32
Inventor 徐向军高建忠张续彬马立朋胡广瑞顾晓勇乔新旺刘申赵飞蔡纪伟刘洪武范军旗王杰刘斌孙楠
Owner CHINA RAILWAY SHANQIAO GRP CO LTD
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