Temperature control measures for welded H-beam structures

Drying high-frequency welding H-section steel when the use of heating zinc pot flue gas preheating through the heat of the spiral pipe for high-frequency welding H-section steel indirect drying, at the same time to make high-frequency welding H-section steel at both ends of the temperature is slightly higher, to avoid high-frequency welding H-section steel in the water vapor escape from both ends of excessive water dilute high-frequency welding H-section steel at both ends of the help The plating solvent, and then appear in the high frequency welding H-section steel end leakage plating, so as to not get high quality galvanized layer. The intermediate temperature is 20~30℃ lower than the two ends of the high-frequency welding H-beam.

High frequency welding H-shaped steel inside and outside the surface of the aid plating solvent must be dried in hot dip galvanized high frequency welding H-shaped steel if there is not drying to hot dip galvanized drying temperature and there is more moisture, it is not drying. The following defects may occur in the hot-dip galvanizing of high-frequency welded H-beam steel without drying ① the hydrogen produced by pickling in the metal matrix of high-frequency welded H-beam steel can not be fully discharged, which will affect the external quality of galvanized layer. (2) Make high-frequency welding H steel metal matrix unnecessary corrosion and produce ferric chloride, increase the consumption of zinc, galvanized layer surface rough (3) zinc liquid effective aluminum composition due to the strong oxidation of water and produce a lot of aluminum oxide (A2O3).

Welding h-beam structure under high temperature environment, when the bearing capacity and deformation can not meet the requirements, by taking measures to reduce the stress level in the high frequency welded steel components, increases welding h-beam structure material under high temperature strength, raise the section stiffness of components or lower the temperature of the component in high temperature environment to meet the requirements. For the welded H - shaped steel structure working in high temperature environment for a long time, the expansion type fireproof coating should not be used as the heat insulation protection measure.

Structures exposed to high temperature should take the following protective measures according to different conditions:

When the surface of welded H-shaped steel structure is exposed to heat radiation for a long time up to 150℃ or may be affected by flame in a short time, effective protective measures (such as adding heat insulation layer or water jacket) should be adopted. When the welded H-beam structure may be affected by hot molten metal, it shall be protected by an insulating layer made of brick or heat resistant material. The heat insulation protection measures of welded H-beam structure should be durable under the corresponding working environment and compatible with the anti-corrosion and fire protection measures of welded H-beam structure.