The material and quality of welded parts

The main material and quality focus of welded structural parts

The relationship between steel structure weldments and the number of welds

The connection methods of steel structures can be divided into three types: welding connection, bolt connection and rivet connection. Welded connection is the most important connection method for modern steel structures.

Its advantages are: (1) It can be directly connected to the weldment, the structure is simple, and the production and processing are convenient; (2) The cross section is not weakened, and the material is economical; (3) The connection has good air tightness and high structural rigidity; ( 4) It can realize automatic operation and improve the quality of welding structure.

The disadvantages are: (1) In the heat affected zone near the weld, the material of the steel becomes brittle; (2) The residual stress and deformation of the welding reduce the bearing capacity of the compression member; (3) The welded structure is very sensitive to cracks, and It gets colder at low temperatures. crispy. The problem is more prominent.

Main materials for welded structural parts

Most welded structures are a fraction of billets, castings, forgings and stampings with metallic rolled material (sheets and profiles). Except for a part of processing, the latter can be directly welded, but welded structure welded structure can be used to make blanks, which must go through a series of processes before assembly, including correction (school), line (quantity), cutting (bottom), edge treatment, forming, Bending, welding, slope cleaning, etc. , these steps are crucial, the importance of which is that the quality of material processing will directly or indirectly affect product quality and production efficiency.

Metal processing has a considerable proportion in welding production, such as heavy machinery welded structures, accounting for 25% to 60% of all processes. Therefore, the use of advanced processing methods improves the mechanization level of the material processing process, and plays an important role in improving the processing quality and labor productivity.

Quality emphasis of different types of welded large structural parts

Beam welded structures, this product features components that form transversely curved beam structures. When multiple beams are formed into a beam structure, each beam becomes more complex;

Column welded structural components, these structural members are characterized by load bearing capacity, simultaneous rotation, and simultaneous longitudinal bending stress. Column-welded structural components are commonly used in various profiled steel composites resulting in so-called durable wall composite cross-sections. These forms can increase the moment and improve the stability of the structure;

Lattice large welded structure is composed of a series of rods or piercing rods, and each rod is connected to each other in the form of nodes;

Skeleton structures are usually hoisting and conveying machinery parts, which usually bear moving loads and therefore need to have minimal weight and lower rigidity;