Nov. 15, 2019
As a Steel Structure Engineering Contractor, share the welding of steel structures with everyone.
Common welding methods for steel structures are arc welding, including manual arc welding, automatic or semi-automatic arc welding, and gas shielded welding.
Manual arc welding is the most commonly used welding method in Light Steel Structure Warehouse. It has simple equipment and flexible and convenient operation. However, the labor conditions are poor, the production efficiency is lower than that of automatic or semi-automatic welding, and the variability of the weld quality is large, which depends to some extent on the technical level of the welder.
The quality of the automatic welding seam is stable, with fewer internal defects, good plasticity, and good impact toughness. It is suitable for welding longer direct seams. Due to manual operation, semi-automatic welding is suitable for welding curves or welds of any shape. Automatic and semi-automatic welding should use welding wire and flux suitable for the main metal. The welding wire should meet the requirements of national standards. The flux should be determined according to the welding process requirements.
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Gas shielded welding uses inert gas (or CO2) gas as the protective medium of the arc to isolate the molten metal from the air to keep the welding process stable. Gas-shielded arc welding has concentrated heating, fast welding speed and large penetration depth, so the weld strength is higher than manual welding. And good plasticity and corrosion resistance, suitable for welding thick steel plates.
Weld connection forms can be divided into four forms: butt joint, overlap, T-joint and corner joint according to the mutual position of the connected members. The welds used in these connections are in two basic forms, butt welds and fillet welds. In specific applications, it should be selected according to the force of the connection, combined with manufacturing, installation and welding conditions.
The butt welds transmit force directly and smoothly, and there is no significant stress concentration phenomenon, so the force performance is good, and it is suitable for the connection of members that bear static and dynamic loads. However, due to the high-quality requirements of butt welds, the welding the gap between weldments is stricter, and it is generally used in factory-made connections.
2. Fillet weld
Forms of fillet welds: Fillet welds can be divided into side fillet welds parallel to the force action direction, front fillet welds perpendicular to the force action direction, and the oblique intersection with the force action direction according to their length and external force action direction. Diagonal fillet welds and surrounding welds.
Fillet weld section types are divided into ordinary type, flat slope type and deep melting type. Hf in the picture is called the fillet size of the fillet weld. The ratio of the side of the welding foot of the ordinary cross-section is 1: 1, which is similar to an isosceles right-angled triangle. The force line is bent sharply, so the stress concentration is serious. For structures that are directly subjected to dynamic loads, in order to smooth the force transmission, the front fillet weld should adopt the flat slope type with a ratio of two weld fillet sides of 1: 1.5 (the long side goes in the direction of the internal force), and the side fillet weld should use a ratio of 1. : 1 deep penetration.
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