-
Categories
-
Pharmaceutical Intermediates
-
Active Pharmaceutical Ingredients
-
Food Additives
- Industrial Coatings
- Agrochemicals
- Dyes and Pigments
- Surfactant
- Flavors and Fragrances
- Chemical Reagents
- Catalyst and Auxiliary
- Natural Products
- Inorganic Chemistry
-
Organic Chemistry
-
Biochemical Engineering
- Analytical Chemistry
- Cosmetic Ingredient
-
Pharmaceutical Intermediates
Promotion
ECHEMI Mall
Wholesale
Weekly Price
Exhibition
News
-
Trade Service
Welding is the process by which a material (of the same or different kind) of a welded work piece is formed by heating or pressurization or both, and by filling the material with or without filling it, so that the material of the work piece achieves the binding between atoms.
So what are the main points of stainless steel welding points and precautions? Stainless steel welding rods can be divided into chromium stainless steel welding rods and chrome nickel stainless steel welding rods, which meet the national standard, are assessed according to the national standard GB/T983-2012 regulations.
chrome stainless steel has a certain degree of corrosion resistance (oxidizing acid, organic acid, cavitation) heat and corrosion resistance.
are usually selected as power stations, chemicals, petroleum and other equipment materials.
but chromium stainless steel is generally poor weldability, should pay attention to welding process, heat treatment conditions and the selection of suitable welding rods.
chrome nickel stainless steel welding rod has good corrosion resistance and antioxidant resistance, widely used in chemical, fertilizer, petroleum, medical machinery manufacturing.
In order to prevent intercrystalline corrosion due to heating, welding current should not be too large, less than carbon steel welding rod about 20%, arc should not be too long, fast and cold between layers, to narrow welding path is appropriate.
1, the use of vertical external characteristics of the power supply, DC when the use of positive polarity (welding wire negative pole) 1, generally suitable for the welding of sheets below 6mm, with weld molding beautiful, welding deformation of small characteristics.
(thanks for paying attention to Dingding automatic welding) 2, the protective gas is argon, purity is 99.99%.
when the welding current is 50 to 150A, the argon flow is 8 to 10L/min, and when the current is 150 to 250A, the argon flow is 12 to 15L/min.
3, tungsten pole from the gas nozzle protruding length, to 4 to 5mm as the best, in the corner welding and other poor masking is 2 to 3mm, in the slotted depth of the place is 5 to 6mm, nozzle to work distance generally does not exceed 15mm.
4, in order to prevent the appearance of welding pores, welding sites such as rust, oil, etc. must be cleaned up.
5, welding arc length, welding ordinary steel, 2 to 4mm as the best, and welding stainless steel, 1 to 3mm as the best, too long is not good protection effect.
6, butt bottom, in order to prevent the back of the bottom welding channel is oxidized, the back also needs to implement gas protection.
7, in order to make argon well protect the welding melting pool, and facilitate welding operation, tungsten pole centerline and welding workware should generally maintain an angle of 80 to 85 degrees, filling wire and work piece surface angle should be as small as possible, generally about 10 degrees.
8, wind protection and gas exchange.
windy areas, please take measures to block the net, while indoors should take appropriate air-breathing measures.
2, stainless steel MIG welding points and precautions 1, the use of flat characteristics welding power supply, DC when using anti-polarity (welding wire positive pole) 2, generally using pure argon (purity of 99.99%) or Ar-2% O2, flow rate of 20 to 25L/min is appropriate.
3, arc length, stainless steel MIG welding, generally in the injection transition conditions down welding, voltage to adjust to the arc length of 4 to 6mm degree.
4, windproof.
MIG welding is susceptible to wind, sometimes the breeze produces pores, so wind speed above 0.5m/sec, should take wind protection measures.
, stainless steel core welding points and precautions 1, the use of flat characteristics welding power supply, DC welding using anti-polarity.
use the general CO2 welding machine can be welded, but the pressure of the wire wheel please slightly loosen.
2, the protection gas is generally carbon dioxide gas, gas flow to 20 to 25L / min is more suitable.
3, the distance between the welding nozzle and the work piece is 15 to 25mm.
4, dry extension length, the general welding current of 250A below about 15mm, 250A or more when about 20 to 25mm is more suitable.
.