The welding wire metal has Alloy Group 20. The original metal Co-Cr has good wear resistance. Corrosion and oxidation are good at high temperatures Another outstanding feature is that it maintains its hardness at high temperatures.
udo.co.th The equipment center, grinding machines, grinding wheels and various tools for welding work of all kinds. We have a team of highly experienced professionals to give advice and consultation to all customers.
Which can be used at The temperature does not exceed 600 ° C. Welding must be heated before welding 400-600 C and after. to cool slowly and heat treatment is not required.
Application : All kinds of assembly works, exhaust valve seats of internal combustion engines, steam engine valve seats, pump shafts and parts with severe corrosion and erosion.
Alloy Group 21
properties of the weld metal obtained from this group of original metals based on chromium content Carbide and Tungsten Carbide Usually metal powder Chromium carbide and tungsten carbide formed into a Rod or Core Wire to be welded. The weld content has good wear resistance, while the toughness depends on the percentage of carbides mixed in the bonding substrate. The welding process must be preheated at 400-600 °C and without baking. heat treatment
implementation Tools and machine parts applied to stone mining, drill bits and abrasive screws for the ceramic industry.
Alloy Group 22
The weld material obtained from the original metal Ni-Cr-B is resistant to abrasive wear and hardness at high temperatures. Hardness at room temperature increases with increasing C, Cr and B content, ranging from 30-60 HRC. The weld can be used with high temperatures up to 500 C. Welding must be preheated at 400 ‘C and no welding is required. heat treatment Applications: valves, worm screws, slurry concrete pump shafts and other types of pumps.
Alloy Group 23
The original Ni-Cr-Mo alloy has good high temperature properties. Hardening can be achieved by correct heat treatment. Applications – Hot forming tools Valve seat contact in chemical industry and used to reinforce high temperature cutting blades
1,3 Non-Ferrous Filler Metals
Alloy Group 30
These original metals were copper-tin alloys containing 6-12% Sn and 0.5% phosphorus.
The deposition hardness ranges from 60-130 HB and depends on the Sn content. These alloys have high resistance to sliding wear, resistance to solutions, salts and acids.
Applications: Bearing shells, shafts, valve gauges, valves, housings, worm gears and helical gears.
Alloy Group 31
This group of filler metals has 5-15% aluminum as the main alloy. For bi-element alloys, it has
Hard 100-200 HB and has chemical resistance.
mechanical properties Corrosion resistance and working properties depend on the amount of alloying elements added, i.e. Fe, Ni and Min.
Alloy Group 32
This group of filler metals is a copper-nickel alloy. Containing 3-45% nickel, alloy steel up to 1.5% and manganese alloying up to 3.5%, hardness up to 160 HB, resistance to stress corrosion cracking, especially seawater resistance.
Applications: Water distillers, sea water pipes, condensers, chemical equipment and coolers.
2. Symbol
The welding wire symbol is intended to facilitate the selection and use of filler wires and also
Indicates the properties of the weld surface.
2.1 Letter codes related to original metals 1) Codes representing the welding process.
G gas welding
E Manual arc welding
MF Metal-Arc Welding using flux wire
TIG TIG welding
MSG Metal Shielding Gas Welding (Mix)
UP Under-flux welding
3) The letter code indicates the production process of additive metal.
The method of producing filler metal is designated by the following symbols.
GW Rolling
GO Casting
GZ Pull-down
GS Powder metallurgy
GF core wire with filament
UM The core wire is flux-shielded.
4) The code number indicates the degree of hardness.
Table 2 shows the degree of hardness of the non-heat treated weld. The heat treatment is done according to the original metal manufacturer’s instructions. The hardness value is the hardness of the weld metal obtained from welding caused by welding wire, flux or welding wire with a gas shield. The flux and shielding gas must be specified exactly. because if there
Flick change And the shielding gas will also change the word of hardness.
5) The letter code shows the properties of weld nicks.
If more than one letter is required, arrange them in alphabetical order.
C = corrosion resistance
G = Abrasive wear resistance
K = ability to increase hardness with work hardening from use, such as pressure, rolling force or impact (for example, steel
high manganese mix)
N = Non-magnetic
P = impact resistance
R = Rust resistance
S = Ability to cut HSS)
T = High strength at high temperatures, i.e. high temperature tool steel
Z = high temperature applications (no scaling) applications at temperatures above 600 C
The properties of the weld may depend on the heat treatment process specified by the manufacturer.
- Examples of Symbols
3.1 Symbol of the original metal
Alloy Group filler metal is gas welding rod wire (G) can be written as follows
Filler Rod DIN 8555-G1
Alloy Group 2 Mig Welding Wires (MSG) are produced from solid wire rods by
Pull(GZ) can be written as follows
Wire Electrode DIN 8555-MSG2-GZ
3.2 Symbol for weld metal
1) Gas Welding Rod
Alloy Group 1 filler metal is a gas (G) electrode that gives a weld hardness of 225-275.
HB(250) Hardness and wear resistance properties obtained from non-heat treated weld metal are written as follows:
Filler Rod DIN 8555-G1-250
2) Electrodes
Original metal Alloy Group 9 flux-clad type (UM) for welding Hand welding (E) gives a weld with a hardness of 175-225 HB(200) and corrosion resistance (C) and heat resistance (Z). It is written as follows:
Electrode DIN 8555-E9-UM-200-CZ
Original metal Alloy Group 7. Flux cored wire (ME) gives a weld hardness of 225-275 HB(250), work hardening (K) and impact resistance ( P) can be written as follows:
Cored Wire Electrode DIN 8555-MF7-250-KP
3) gas welding wire and welding wire/flux
Welding material obtained from Alloy Group 2. Welding wire used with gas shield. For MIG welding (MSG), filament wire is reduced to size (GZ) in which welding is performed with M23 gas shield according to DIN 32526, yielding a weld hardness of 375-450 HIB (400) is written as follows:
Weld Metal DIN 8555-MSG2-GZ-M23-400
The welding content obtained from welding wire is used in combination with flux. For under-flux welding (UP), Alloy Group 1 welding electrodes are produced by Pull-Reduced Size (GZ) and flux FCS167 according to DIN 3252 2. The weld hardness is 225-275 HB(250) writable. as follows
Weld Metal DIN 8555-UP1-GZ-FCS167-250
7.3 Standard for flux-covered welding electrodes For hardfacing welding (JIS Z3251-1991)
This Japanese industrial standard has specified flux-coated electrodes for top-coating welding Iron and steel skin
- Type of welding wire
Welding wires are divided into types. according to the chemical composition of the weld metal, the type of flux bottom and welding position as in Table 1
- Symbol of welding wire
Example D: Properties of the chemical composition of the solder paste.
E : main alloying material 2A : flux-coated electrode
- Type of Coating Flux Code
B : Different R : High Titanium Oxide BR : Light Techanium S : Special
- Codes for Welding Position are as follows:
P : Know V : Loud posture H : Level posture
The welding positions are shown in Table 1, not for wires larger than 5.0 mm for vertical and level welding.
- Chemical ingredients
- Hardness The hardness of the weld content shown in Figure 3 is the Nominal Hardness value. The test is performed according to the specified standards.
- Symbol of production
The symbol contains Wire Type Nominal Hardness, Type of Flux Type of current, wire core diameter and length.
7.4 Standard for flux-filled arc welding wire for hardfacing(JIS Z 3326-1991)
This Japanese Industrial Standard requires flux cored wires Used for manual welding. Gas shielded and non-gas shielded (Gas-Shielded Arc Welding and Self-Shielded Arc Welding) for hardfacing on iron and steel.
- Type of welding wire
Welding electrodes can be classified according to the type of shielding gas and the chemical composition of the electrode.
- Symbols used for the manufacture of welding electrodes.
Consists of electrode type, normal hardness, diameter and weight of electrode.