What are the considerations for using large flanges?
The scope of application of large flanges is very wide, the use of large flanges is also very popular, then you know the use of large flanges notes?
1, in order to prevent the large flange cover heating and produce inter-eye corrosion, welding current should not be too large, less than carbon steel welding rod about 20%, arc should not be too long, between layers of fast cooling, to narrow welding path is appropriate.
2, welding rod use should be kept dry, titanium calcium type should be dried by 150 degrees C 1 hour, low a hydrogen type should be dried by 200-250 degrees C drying 1 hour (can not be repeated drying, otherwise the skin is easy to crack and peel), to prevent the welding rod skin sticky oil and other dirty things, so as not to cause welds to increase carbon content and affect the quality of the weld.
3, large welding neck flange fitting welding, by repeated heating to precipitate carbon, reduce corrosion resistance and mechanical properties. 4, chromium large flange tube after welding hardened large-scale flange large, easy to produce cracks. If the same type of chrome stainless steel welding rod (G202, G207) welding, must be more than 300 degrees C preheating and welding after about 700 degrees C slow cooling treatment.
If the welding parts cannot be treated after welding, large flange fitting solder solders (A107, A207) should be used. 5, large flanges, in order to improve corrosion resistance and welding and appropriate increase the appropriate amount of stability elements Ti, Nb, Mo, etc. , welding than chromium large flanges better. When using the same type of large chrome flange welding rod (G302, G307), the warm-up of more than 200 degrees C and the return treatment of about 800 degrees C after welding should be carried out.
If the welding parts cannot be heat treated, large flange fitting solder solders (A107, A207) should be used.
6, large-scale flange fittings, welding large-scale flange welding rod has good corrosion resistance and antioxidant resistance, widely used in chemical, fertilizer, petroleum, medical machinery manufacturing. The above is introduced to you is the use of large flange notes, I hope to be able to help you, if there is anything else that does not know where can directly communicate with our customer service, we are happy to serve you, thank you for your
