Small-section square girder and welding process thereof

A welding process and small cross-section technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of low welding quality, achieve the effects of improving torsion resistance, long longitudinal length, ensuring stability and reliability

Active Publication Date: 2012-11-14
SHANXI PINGYANG IND MACHINERY
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Problems solved by technology

[0005] The present invention aims to solve the problem of low welding quality existing in the small welding space of existing manual welding, and provides a small cross-section square girder and its welding process

Method used

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  • Small-section square girder and welding process thereof

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Embodiment 2

[0027] Such as figure 1 A small cross-section square girder shown in the figure consists of four pairs of beam plates with a width of 200mm and a length of 9m to form a box-shaped inner cavity, and a rib plate 2 is arranged in the inner cavity, and flanges are welded at both ends of the beam plate 1. The inner and outer fillet welds are used between beams and slabs and between beams and flanges.

[0028] When soldering, the following steps are involved:

[0029] 1. Before welding, clean up the oil, dirt, scale, etc. in the 25mm area on both sides of the weld;

[0030] 2. Install welding arc starting plate and arc closing plate;

[0031] 3. Use the automatic welding trolley to carry out the bottom welding of the inner cavity boat welding, starting from the arc striking plate to the arc closing plate, the welding seam height is 5~6mm, and welding is performed in diagonal order during welding; the diameter of the welding wire is φ1 .2; welding current 120~150A; arc voltage 22~...

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Abstract

The invention discloses a small-section square girder and welding process thereof, belonging to welding technology and capable of solving the problem of low welding quality in case of small manual welding space. The small-section square girder has four girder plates with widths of 200-220mm and lengths smaller than or equal to 10m in paired arrangement to form a box-shaped inner cavity, in which are arranged reinforcement rib plates, flanges are welded at two ends of the girder plates, and inside and outside fillets are present between the girder plates and between the girder plates and the flanges. In welding, a to-be-welded part is cleaned before welding, a run-on plate and a run-off plate are assembled and welded, welding is carried out by use of an automatic welding cart, an inner cavity and an exposed welding seam alternate welding sequence is adopted during welding, an inner cavity backing welding seam is firstly formed, the backing welding seam for an exposed welding seam is then formed after the back gouging is strictly performed, the inner cavity and the exposed welding seam are sequentially formed, and a back-step welding method is adopted. According to the invention, welding deformation is controlled within an allowable range, torsion resistance and shearing resistance of the small-section square girder are improved, and stability and reliability of the girder are ensured.

Description

technical field [0001] The invention belongs to the welding technology, and relates to a square girder with a small cross-section and a welding process thereof. Background technique [0002] At present, in the coal washing and coal preparation of coal mining machinery, house construction, bridges, lifting equipment and other industries, the small cross-section square girder structure design is widely used, and its stability, reliability and work efficiency during operation are very important. [0003] The girder structure design usually adopts the welded structure design. The internal and external distribution of the weld seam often bears instantaneous impact and alternating load in the working state, and the stress is complicated, so the welding quality of the product is very high. At present, the welding method commonly used in China is manual CO2 gas shielded welding. When the cross-section of the beam involved is small, the welding operation space is narrow, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16F16S3/00
Inventor 海卫东佐勇
Owner SHANXI PINGYANG IND MACHINERY
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