Knowledge of welding materials |
welding material
1 what is the welding material? What?
Answer: welding materials including welding rod, welding wire and flux, gas, electrode, liner etc..
2 what is the name of the wire?
Answer: when welding used as filler metal, and metal wire - conductive wire is called. Divided into solid wire and flux cored wire two. The commonly used solid wire type: ER50-6 (number: H08Mn2SiA).
3 why is a MAG better than CO2 welding joints of welded joints of high impact toughness?
Answer: MAG welding, active gas is only 20%, alloy element transition coefficient in high wire, high impact toughness of weld. CO2 welding wire for 100% active gas, manganese and silicon alloy elements combined deoxidation alloy elements, the transition coefficient is slightly lower than MAG, the impact toughness of weld is high. Such as Tangshan Kobelco wire MG-51T (equivalent to ER50-6) its impact toughness at room temperature value: MAG: 160J; CO2: 110J.
4 what is the flux cored wire?
Answer: by thin steel strip rolled round steel tube, and in which some components of powder filling, a wire drawing together.
5 why the flux cored wire used in CO2 gas protection?
Answer: according to the protection way to distinguish between two types of flux cored wire, welding wire and cored wire cored self. The drug core welding wire CO2 gas is generally used as protective gas, belonging to the joint protection of slag, weld forming, high mechanical properties.
6 why flux cored welding surface by indentation hole?
Answer: because the flux cored wire is made of thin steel band coiled tubular wire, which belongs to the seam welding wire; the moisture in the air will invade the medicine core through the gap and flux moist (not dry), resulting in weld indentation stomata.
7 why the CO2 gas purity requirements?
Answer: General CO2 gas is a by-product of chemical production, the purity is only about 99.6%, containing trace impurities and moisture, will lead to the weld defects such as pores. Gas welding important products must use the CO2 purity of not less than 99.8%, less weld porosity, low hydrogen content, good crack resistance.
8 why the purity of argon has high technical requirements?
Answer: currently on the market there are three argon: General argon purity 99.6% or so), pure argon purity (99.9%), high purity argon (purity 99.99%), before the two welding of carbon steel and stainless steel; welding of aluminum and aluminum alloy, titanium and titanium alloy and nonferrous metal must select high purity argon; avoid weld and heat affected zone is oxidized to welding.
9 Why TIG welding nozzle has a variety of specifications size?
A: there are 4 - No. 8 five kinds of specifications of the nozzle, welded carbon steel can choose 4 - No. 5 nozzle, welding stainless steel and aluminum and aluminum alloy 6, No. 7 big nozzle should be used, in order to strengthen the protection scope of the weld and heat affected zone. The welding of titanium and titanium alloy and other non-ferrous metals should choose 7 nozzle No. 8 more, in order to prevent the oxidation of weld and heat affected zone.
10 what is the acid electrode?
Answer: multi drug skin contains acidic oxides electrode, such as 422 (E4303), 502 (E5003), AC and DC electric welding.
11 what is the basic electrode?
Answer: the medicine skin contains more than alkaline oxide and fluoride electrode, such as 507 (E5015), 506 (E5016), welding rod.
12 what is cellulose type (under the special welding electrode to)?
Answer: contain large amounts of organic matter in coating electrode, pipe and plate structure under vertical to welding.
"1" such as E6010 (equivalent to E4310, J425G) for backing welding, thermal welding, filler welding.
"2" (the equivalent of E8010 E5511, J555) is suitable for heat welding, filler welding and cover welding layer.
General use of low hydrogen electrode to cover weld; E7048 (equivalent to J506X) weld and neat and beautiful appearance.
13 why before welding electrode should be strictly dry?
Answer: electrode often due to moisture absorption and the process of the bad performance, which increases the arc instability, splash, and prone to defects such as pores and crack. Therefore, the electrode before use must be strictly drying. General acid electrode drying temperature 150--200, time for 1 hours; the basic electrode drying temperature of 350--400 DEG C, 1--2 hours after drying in an incubator at 100--150, with.