沈阳中达钢结构工程有限公司
HENYANG ZHONGDA STEEL STRUCTURE ENGINEERING CO. LTD
SHENYANG ZHONGDA STEEL STRUCTURE ENGINEERING CO. LTD
LIAONING ZHONGDA SHENGBANG INDUSTRIAL CO. LTD
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Automatic welding of steel bridge manufacturing industry is imperative

position: Home >> News >> Industry news

Automatic welding of steel bridge manufacturing industry is imperative

Release date:2018-01-26 Author: Click:

Although our country in such aspects as design, manufacture and erection of steel bridge's technical level has greatly improved, Narrows the gap with developed countries, but should be clearly aware that our steel bridge built with developed countries still have certain disparity, the development of the steel bridge construction in China is still very uneven. 2012 Bridges of steel bridge by the end of 2012 the United States (33%), Japan 130000 Bridges of steel bridge (41%), France accounted for 85% of the total bridge steel bridge, and the total number of more than 590000 Bridges in our country, but fewer than 1% of the total steel bridge, therefore also has the very big development space. Compared with the continuous expansion of the steel bridge manufacturing scale in China, the development of steel bridge manufacturing technology is slow, and the welding process mainly adopts submerged arc welding and gas protection.

The method of semi-automatic welding (or auxiliary tracking device) still relies mainly on manual work, which is relatively backward compared with the large number of engineering machinery, automobile and other industries with robot welding. At present, we are faced with the reality of the shortage of manufacturing technology workers and the gradual improvement of labor cost. It is imperative to innovate the automation welding technology in the steel bridge manufacturing industry.

Difficulties in automatic welding of bridge steel structures.

(1) it is difficult to realize the design of the large span truss steel bridge of automation welding by the structural influence of the components. The structure of steel beam is complex and diverse, and it is not convenient for automatic welding. In nanjing GuanQiao MS26 node bar, for example, in addition to the node and lower chord, stiffening chord connection, also with bridge panel, cross beam, vertical and diagonal connected, connect the tie bar, a total of 45 Kong Qun bolt connections, complex connection relations. Due to the large force, the maximum thickness of the plate is 52mm, and the welding quantity is large.

Under the influence of its space structure, the weld space between the internal weld and the whole node of the box-type rod is small, so the automatic welding cannot be adopted.

(2) affected by the welding position is difficult to realize automatic welding automation welding current is given priority to with flat position welding, a small amount of stand, transverse weld can realize gas shielded welding machine, automatic welding but lifted up a weld is difficult to realize the welding automation. Taking the steel box girder of the hong kong-zhuhai-macau bridge as an example, the welding of webs, transverse baffles and roof elevation Angle can not be used for automatic welding in the overall assembly of girders. Due to the influence of stiffening rib structure, transverse diaphragm plate, web plate and floor Angle weld, transverse bulkhead and interwebs Angle welds can not be used for automatic welding.


Bridge steel structure

Bridge steel structure

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Related tags:Bridgesteelstructure

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