Construction Technology for Welding High-Performance Weathering Steel Bridges in Cold Winter Environments
In terms of the welding construction of the bridge site of Heilongjiang Bridge in the cold winter environment at-48 ℃,combined with the structural characteristics of the transverse and longitudinal beams of Heilongjiang Bridge,the movable heating insulation shed was used,the industrial heater was used for heating in the shed,with tiled induction heating belt for preheating before welding,so that the welding environment and welding preheating could meet the process requirements.After welding,the post-heating measures were taken,a special welding process was adopted,and welding heat input was controlled to guarantee the welding quality.The results showed that for the high-performance weathering steel welded joints,the impact energy at-40 ℃ KV2≥47 J,the impact energy at-60 ℃ KU2≥47 J,and the atmospheric corrosion resistance index I≥6.0,which met the demands for winter welding of bridge steel beam manufacturing and the application requirements of non-painting.This method can be applied to winter welding construction of steel structures in other cold areas in China as well.For example,this technology can support the high-quality and efficient construction of the Sichuan-Tibet Railway,which is located in a plateau alpine area with a complex environment,bad climate low temperature,and a large temperature difference between day and night,and provide guarantees for construction in cold winters.
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