Steel Structure Building Connection Method-Weld Connection
The steel structure building is composed of many aspects, among which the steel structure connection is an important part. There are three most common connection methods, weld connection, bolt connection, and rivet connection.
Features of weld connection
* Components of any shape can be directly connected, and the connection structure is convenient;
*Good air-tightness and water-tightness, greater structural rigidity, and better integrity;
*Automatic operation can be realized.
*The residual stress of welding makes the structure prone to brittle failure, the shape and size of the structure change, and the bearing capacity of the compression member is reduced;
* Welding cracks are easy to expand;
*High requirements for materials.
Common Welding Defects
Collapse, undercut, burn through, slag inclusion, pits, incomplete welding, incomplete welding, pores, cracks.
Welding Quality Inspection
Weld Level Requirements
Welding seams should be selected according to the importance of the structure, load characteristics, welding seam form, working environment and stress state, etc., and different quality levels should be selected:
Weld Connection Type And Weld Type
According to the relative position of the two weldments, they are divided into flat joints, lap joints, T (top) joints and corner joints.
1) Butt welds are divided into force and weld direction
A: Straight seam: the direction of the force is orthogonal to the direction of the weld
B: Oblique seam: the direction of the force and the direction of the weld are obliquely intersected
A: End seam: the direction of force is perpendicular to the length of the weld
B: Side seam: the direction of force is parallel to the length of the weld
A: Continuous weld: better stress
B: Intermittent welds: stress concentration easily occurs
Overhead welding, vertical welding, horizontal welding, and overhead welding, among them, overhead welding has the best construction position, so the weld quality is also the best, and overhead welding is the worst.
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