Double-layer welding should be used when welding thick steel plates above 9mm at negative temperature, and the welding should be sprayed from bottom to top. It is forbidden to strike the arc on the welding raw material. When the steel structure is installed on site, if it snows or the wind is above 6m/s, a protective shed should be erected.

Welding that does not pass completely eliminates re-welding, and stops welding according to the standard of welding processing technology of steel structure at negative temperature. When the working temperature is less than 0 °C, the brushing process test is carried out in the brushing anti-corrosion material line. When brushing, it is necessary to clear and clean the rust, oil stains, burrs and other objects on the surface of the components, and keep the surface boring. Do not stop painting when it snows or when there is thin ice on the components.

When transporting and piling up steel structures in winter, anti-skid measures are adopted on the ground. When the components of the same type and specification are stacked, the components should be persistently level, the pads should be placed on the same line, and the components should be prevented from slipping. Before the installation of the steel structure, according to the requirements under the negative temperature standard, the quality of the steel structure shall be re-inspected, and the components that are misinspected during production and deformed during transportation and accumulation shall be repaired and corrected in mid-air.

When using steel cables to lift steel components, it is necessary to add anti-skid spacers on the ground, the connection point plates that are hoisted at the same time with the components, and the fixtures used by the installation staff to be securely tied with rope locks. According to the data chart of the temperature standard extra-stamp steel member device, the standard stop device is strictly followed during the construction of the project. In the welding process of the customized steel structure device, the two sides of a component cannot be welded at the same time.