Do you know what the limit temperature can be borne by the corrugated expansion joint?
During the welding process of metal expansion joint of bellows manufacturer in Guizhou, there are always pores occurring. But how do we prevent pores from occurring in normal work? In science as a professional manufacturer of expansion joint bellows, Guizhou sales manufacturers now have metal bellows expansion joints porosity to talk about a few wise remark of an experienced person in the weld, take some preventive measures on stomatal production:
1, prohibited the use of skin cracking, spalling, metamorphism, eccentric or severe corrosion of electrode welding core;
2, electrodes and flux before use should be according to the requirements of the general acid electrode baking, baking temperature is 150-200 degrees Celsius, the basic electrode baking temperature of 350 to 400 degrees Celsius, after drying on the 100-150 C electrode insulation box, with access to, and to conduct a manual welding electrode baking in strict accordance with the requirements no, instead of the drying temperature, baking time longer than the low, also should not be repeated drying;
翡翠棋牌3, gas welding should pay attention to the purity of the gas and water, must comply with the provisions of the relevant standards, the carbon dioxide cylinder down. After a period of time, can release the cylinders in the remaining water from the bottle inside the valve, reduce the water content of carbon dioxide gas in the dryer set in the gas system which can reduce the protective gas or not the water content of b;
4, bellows welding of carbon steel should be used in the operation to the neutral flame, good coordination。
5, the expansion of groove and welding section on both sides before the construction of base metal wire, with clean, thoroughly remove oil dirt, moisture, rust and other dirt;
6, choose the appropriate welding current and welding speed, and use short arc welding to facilitate the full escape of gas and avoid porosity defects. Preheating can reduce the cooling rate of slow melting.
7, welding should be to prevent the effects of wind and rain and other harsh environment, outdoor gas welding should be set when the wind board, welding pipes should pay attention to effect of tube chuantangfeng;.