Method for welding thick steel plate for bridge

Abstract

The invention discloses a method for welding a thick steel plate for a bridge. The method comprises the following steps that (1) the thickness of the steel plate is 20 to 50 mm; at least six segmenting grooves, vertical to a butt-joint face, are respectively formed in the corresponding positions of two thick steel plates in a manner of butt-jointing the steel plates with same thickness; (2) preheating: two sides of the butt-joint face are preheated; (3) pre-welding: after the preheating is performed in place, the middle position and two ends of the butt-joint face are welded immediately, so that the segmenting grooves are connected; (4) welding: one end of the butt-joint face is welded to the other end of the butt-joint face, and then is welded to an initial end in a zigzag welding manner, the temperature of a welding point is controlled to be 240 to 280 DEG C, the back face of each welding point is subjected to back gouging after the zigzag welding is finished, shielded metal arc welding is adopted for welding, and a welding element is subjected to hydrogen elimination treatment after the welding is finished; (5) check. The method disclosed by the invention has the advantages that a deformation amount of a non-thermal effect area of the thick steel plate can be reduced to be minimum by means of segmenting the butt-joint face and welding in a gap staggered manner, so that the welding quality is guaranteed.

Description

technical field [0001] The invention relates to the field of mechanical technology, in particular to a welding method of thick steel plates for bridges. Background technique [0002] Bridges generally refer to structures erected on rivers, lakes and seas to allow vehicles and pedestrians to pass smoothly. In order to adapt to the modern high-speed development of the transportation industry, bridges are also extended to buildings that cross mountain streams, poor geology or meet other transportation needs to make traffic more convenient. A bridge is generally composed of a superstructure, a substructure, a support and ancillary structures. The superstructure is also called a bridge span structure, which is the main structure for crossing obstacles; the substructure includes abutments, piers and foundations; Or the force transmission device installed at the supporting place of the bridge abutment; the auxiliary structures refer to the bridge head board, conical slope protecti...

AI Technical Summary

Problems solved by technology

[0004] The weldability of thick steel plates for bridges is poor. The selection of the welding groove and the welding process are the key steps in its welding. If the groove opening is unreasonable and the welding parameters are not selected during welding, it will lead to incomplete fusion, Problems such as cold cracks and joint embrittlement