Precautions for butt welding elbow
The welding rod for butt welding elbow shall be kept dry during use. The titanium calcium type shall be dried at 150 ℃ for 1 hour, and the low hydrogen type shall be dried at 200-250 ℃ for 1 hour (repeated drying is not allowed, otherwise the skin is easy to crack and peel off), so as to prevent oil and other dirt on the electrode skin, so as not to increase the carbon content of the weld and affect the quality of the weldment. In terms of varieties, general-purpose pipes are more than 1.9 million tons, accounting for 55%; 770000 tons of oil pipes, accounting for 6%; More than 150000 tons of hydraulic props and fine pipes, accounting for 4.5%
Stainless steel stamping elbow fittings, bearing pipes and automobile pipes account for 50000 tons, accounting for 1.5%. The billet is sent into the furnace for heating, the temperature is about 1200 ℃, and the fuel is hydrogen or acetylene. The temperature control in the furnace is the key problem.
previous page:Application of oil casing
next pageCharacteristics of carbon steel pipe fitting tee