Multi-wire submerged-arc multi-layer multi-pass welding process

A multi-layer, multi-pass, welding process technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems that cannot meet the multi-layer and multi-pass welding of large and thick plates, the thickness of the plate to be welded is small, and there is no low temperature toughness. , to achieve the effect of reducing post-weld correction and deformation adjustment workload, controlling welding deformation, and preventing welding cracks

Inactive Publication Date: 2012-07-18
CHINA NAT OFFSHORE OIL CORP +1
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AI Technical Summary

Problems solved by technology

[0002] The existing multi-wire submerged arc technology generally adopts single-layer single-pass double-sided welding, the thickness of the plate to be welded is small, and there is almost no low-temperature toughness and CTOD—— Crack Tip Opening Displacement crack tip opening displacement (CTOD standard adopts BS7448- 1991 Fracture mechanics toughness test) requirements, so it cannot meet the multi-layer multi-pass welding of large and thick plates in the field of marine engineering
The original single-wire and double-wire submerged arc technology has low welding efficiency and large labor investment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] Welding for KCROP project jacket pipe making. The material of the leg rack is API 2H Gr.50. This steel is of the same strength level as the carbon steel of D36 or E36, and the wall thickness is 38mm to 60mm. It is welded using the welding process of the present invention:

[0021] 1. Preparation before welding:

[0022] ①Preparing the groove, grinding group to match the groove, the groove form is asymmetrical X type, the groove gap is 0-1mm, the blunt edge is 1-2mm, and the groove and the range of 25mm on both sides are cleaned, until the metallic luster is revealed;

[0023] ② Preheating before welding, preheating the welding part and its surrounding area within 75mm, the minimum preheating temperature is 65°C, and the preheating method adopts flame heating;

[0024] ③ Welding material: JW-1 welding wire, diameter 4.0mm, SJ101 flux.

[0025] 2. Using multi-wire submerged arc multi-layer multi-pass welding process for welding,

[0026] (1) The maximum interlayer tem...

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PUM

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Abstract

The invention provides a multi-wire submerged-arc multi-layer multi-pass welding process, which includes the steps: firstly, making preweld preparation including preparing and cleaning a welding joint groove, preheating a welding position before welding and selecting proper welding materials; secondly, setting reasonable welding parameters; and thirdly, performing multi-wire submerged-arc multi-layer multi-pass welding. By means of reasonably selecting welding materials, setting the reasonable welding parameters and controlling heat input, preheating temperature and interlayer temperature, the problems of welding cracks, embrittlement of a heat-affected zone and softening of a welding joint are effectively prevented, welding deformation is effectively controlled, the workload of post-weld correction and deformation adjustment is decreased, and welding efficiency and quality are improved.

Description

technical field [0001] The invention relates to a multi-wire submerged arc multi-layer multi-pass welding process. Background technique [0002] The existing multi-wire submerged arc technology generally adopts single-layer single-pass double-sided welding, the thickness of the plate to be welded is small, and there is almost no low-temperature toughness and CTOD—— Crack Tip Opening Displacement crack tip opening displacement (CTOD standard adopts BS7448- 1991 Fracture mechanics toughness test) requirements, so it cannot meet the multi-layer and multi-pass welding of large and thick plates in the field of marine engineering. The original single-wire and double-wire submerged arc technology has low welding efficiency and large labor investment. Contents of the invention [0003] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in existing products, and provide a multi-wire submerged arc multi-layer multi-pass welding proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18
Inventor 曹军韦宝成李志刚杨炳发杨尚玉栾陈杰陈宝洁王建强汪春标马亚光王洪亮
Owner CHINA NAT OFFSHORE OIL CORP
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