A non-consumable tungsten electrode tig
It is possible that the Wheel of history welded the tungsten electrode.
Relevance
Tungsten electrode non-consumable treats. Tungsten electrodes differ in the hardness even when heated up strongly, durability, minimal coefficient of thermal expansion among metals. These electrodes have significant resistance to temperature creep, good thermal conductivity, high modulus of elasticity. The need of the modern industry in such products consistently over many years.
Production
Technological plasticity W is low at normal temperatures, so the electrode getting hot processing under pressure. First, by powder metallurgy make the blank — the so-called Fort. Then heat it and rolled on a rotary forging machine up to Ø 2 — 3 mm… Comes this rod is usually straight lines.
Welding technology
Tungsten electrode — a thin rod may or may not have the special coating. The coating components include: slag and gas-forming, stabilizing, alloying, rascislau. In arc welding, there is a constant discharge in the ionized atmosphere Valitova arc with t° > 1000 °C. the Coal and tungsten electrodes are non-consumable. Therefore, when welding the required welding material — welding wire, which together with the molten metal of the part forms a welding seam. Of the electrode coating stabilizes the arc and protects the molten seam from oxidation by atmospheric gases and gives it the necessary properties. Use of acidic, basic, rutile or cellulosic coating.
Optimization of welding technology
Tungsten electrode (s EEPS) with the additive of zirconium has superior zeigeist a more stable arc. Additive thorium (electrode EW-15) also optimizes zeigeist arc and lengthens the service life of the electrode. When welding non-ferrous alloys better tungsten electrodes doped with Zr, for high-alloyed steels — doped thorium. Obtained weld is very durable, even between parts of different composition. Tungsten electrodes doped with yttrium (EVI-1, EVI-2, EVI-3) can weld parts on a permanent or alternating current. Alternating current power from the welding arc can be single-phase and 3-hasnim. Welding under the protection of argon (further enhances the quality of the weld. The argon protects the work area from the atmospheric gas mixture (N2, O2, CO2). This not only strengthens the seam but also slows down the burning of the electrode. The electrodes last longer .
Domestic brands
The length of the electrodes 1000 mm Ø: 1,6; 2; 3; 4 mm. The electrode surface polished, smooth, without cracks, chips, burrs, grease. Under the order tungsten electrodes are made of any parameters. Marks V. L., ml-2 — suitable for all grades of alloys, used in DC or AC current. Tungsten electrodes VL, VA, IA are of high stability. Stabilized lanthanum electrodes have easy initial arson and re zeigeist of the arc, steady burning, without tendency to burn-through. Compared to pure tungsten doping with 2% La2 O3 increases the maximum current carrying capacity of the electrode by 50%. Such electrodes are more durable than thorium or cerium, didn’t burn quickly and almost do not contribute to weld the tungsten. Uniform distribution of La2 O3 helps to maintain the original sharpening of the electrode. Electrodes SVI-1 / EVI-1 are securely welded fragments of copper alloys, titanium, stainless and low alloy steels DC straight polarity (DC). Utrirovannye electrode is the most stable. Oxides of yttrium to 2.2%, stabilize the cathode spot on the end of the electrode, making the arc very stable regardless of the applied current. Electrodes EVL-2 and EEP (TS 48−19−527−91) are used for arc welding, cutting, welding and spraying in inert gases.
The percentage
| Mark’s electrode | Tungsten | Lanthanum oxide | Impurity Al, Fe, Si, Ca, to |
|---|---|---|---|
| EEPS | more than 99.9 | -- | 0.1 |
| Ml-2 | 97,9 — 98,3 | 1.6 — 2 | 0.1 |
The parameters of the electrodes
| Mark’s electrode | Diameter Ø, mm | Tolerance | Length, mm | Tolerance |
|---|---|---|---|---|
| EEPS | 1, 1.6, 2, 2.5, 3, 4 | ±0.1 | 75; 150; 200 | ±2.0 |
| EEPS | 5, 6, 8 | ±0.2 | 75; 150; 200 | ±2.0 |
| Ml-2 | 1, 1.6, 2, 2.5, 3, 4 | ±0.1 | 75; 150; 200 | ±2.0 |
| Ml-2 | 5, 6 | ±0.2 | 75; 150; 200 | ±2.0 |
Quality
Delivery
The electrode should have a surface smooth, without cracks, burrs, chips, grease etc. the surface of the rod Ø1; 1.6; 2; 2.5 mm is etched. On the surface of the valid colors of a tint, small defects, traces of broaches within the permissible deviations in diameter. The electrodes are trimmed from the ends, while the acceptable chips to 1 mm Deviation from straightness — up to ¼ % of the length of the electrode. To the electrodes of the brand ml-2 is marked with black oil paint.
Imported brand
WP tungsten electrode, WZ8, WL-20, WC-20, WT-20, WY-20, — the most popular for arc welding in an inert atmosphere. Use these electrodes for TIG welding, Tungsten Insert Gas (ADS, GTA, TIG) — automatic, semi-automatic, manual arc welding under the protection of the following compounds: AG2 + 2, AG2 + O2, AG2 + 2.
Table 1. Electrodes in canisters for argon-arc welding
Tungsten electrodes l=175 mm in canisters of 10 pieces
| brand (color code) | diameter, in mm | quantity in 1 kg | additives | Note |
|---|---|---|---|---|
| WC-20 (grey) | 1.6 | 151 | 1.8−2.2% (dioxide of cerium) | Stainless, acid and heat — resistant steel and metals (molybdenum, niobium, Nickel, tantalum, titanium and their alloys, copper, bronze, silicon bronze. |
| WC-20 (grey) | 2 | 96 | 1.8−2.2% (dioxide of cerium) | Stainless, acid and heat — resistant steel and metals (molybdenum, niobium, Nickel, tantalum, titanium and their alloys, copper, bronze, silicon bronze. |
| WC-20 (grey) | 2.4 | 66 | 1.8−2.2% (dioxide of cerium) | Stainless, acid and heat — resistant steel and metals (molybdenum, niobium, Nickel, tantalum, titanium and their alloys, copper, bronze, silicon bronze. |
| WC-20 (grey) | 3 | 42 | 1.8−2.2% (dioxide of cerium) | Stainless, acid and heat — resistant steel and metals (molybdenum, niobium, Nickel, tantalum, titanium and their alloys, copper, bronze, silicon bronze. |
| WC-20 (grey) | 3.2 | 37 | 1.8−2.2% (dioxide of cerium) | Stainless, acid and heat — resistant steel and metals (molybdenum, niobium, Nickel, tantalum, titanium and their alloys, copper, bronze, silicon bronze. |
| WC-20 (grey) | 4 | 24 | 1.8−2.2% (dioxide of cerium) | Stainless, acid and heat — resistant steel and metals (molybdenum, niobium, Nickel, tantalum, titanium and their alloys, copper, bronze, silicon bronze. |
| WL-20 (blue) | 1.6 | 151 | 1.8−2.2% (lanthanum dioxide) | Connecting thin sheets, high alloy steel, overlaying shapes, valves, cutting of aluminium, bronze, copper and high alloy steels. |
| WL-20 (blue) | 2.0 | 96 | 1.8−2.2% (lanthanum dioxide) | Connecting thin sheets, high alloy steel, overlaying shapes, valves, cutting of aluminium, bronze, copper and high alloy steels. |
| WL-20 (blue) | 2.4 | 66 | 1.8−2.2% (lanthanum dioxide) | Connecting thin sheets, high alloy steel, overlaying shapes, valves, cutting of aluminium, bronze, copper and high alloy steels. |
| WL-20 (blue) | 3 | 42 | 1.8−2.2% (lanthanum dioxide) | Connecting thin sheets, high alloy steel, overlaying shapes, valves, cutting of aluminium, bronze, copper and high alloy steels. |
| WL-20 (blue) | 3.2 | 37 | 1.8−2.2% (lanthanum dioxide) | Connecting thin sheets, high alloy steel, overlaying shapes, valves, cutting of aluminium, bronze, copper and high alloy steels. |
| WL-20 (blue) | 4 | 24 | 1.8−2.2% (lanthanum dioxide) | Connecting thin sheets, high alloy steel, overlaying shapes, valves, cutting of aluminium, bronze, copper and high alloy steels. |
| WT-20 (red) | 1.6 | 151 | 1.8−2.2% (thorium dioxide) | Durable. Current for welding — permanent. Easy arc ignition Stability at high currents. You can change the sharpening angle. |
| WT-20 (red) | 2 | 96 | 1.8−2.2% (thorium dioxide) | Durable. Current for welding — permanent. Easy arc ignition Stability at high currents. You can change the sharpening angle. |
| WT-20 (red) | 2.4 | 66 | 1.8−2.2% (thorium dioxide) | Durable. Current for welding — permanent. Easy arc ignition Stability at high currents. You can change the sharpening angle. |
| WT-20 (red) | 3.0 | 42 | 1.8−2.2% (thorium dioxide) | Durable. Current for welding — permanent. Easy arc ignition Stability at high currents. You can change the sharpening angle. |
| WT-20 (red) | 3.2 | 37 | 1.8−2.2% (thorium dioxide) | Durable. Current for welding — permanent. Easy arc ignition Stability at high currents. You can change the sharpening angle. |
| WT-20 (red) | 4 | 24 | 1.8−2.2% (thorium dioxide) | Durable. Current for welding — permanent. Easy arc ignition Stability at high currents. You can change the sharpening angle. |
| WZ8 (white) | 1.6 | 151 | 0.8% (zirconium dioxide) | Similar to pure tungsten. Welding with alternating current the responsible compounds. Easy ignition and arc stability. |
| WZ8 (white) | 2 | 96 | 0.8% (zirconium dioxide) | Similar to pure tungsten. Welding with alternating current the responsible compounds. Easy ignition and arc stability. |
| WZ8 (white) | 2.4 | 66 | 0.8% (zirconium dioxide) | Similar to pure tungsten. Welding with alternating current the responsible compounds. Easy ignition and arc stability. |
| WZ8 (white) | 3 | 42 | 0.8% (zirconium dioxide) | Similar to pure tungsten. Welding with alternating current the responsible compounds. Easy ignition and arc stability. |
| WZ8 (white) | 3.2 | 37 | 0.8% (zirconium dioxide) | Similar to pure tungsten. Welding with alternating current the responsible compounds. Easy ignition and arc stability. |
| WZ8 (white) | 4 | 24 | 0.8% (zirconium dioxide) | Similar to pure tungsten. Welding with alternating current the responsible compounds. Easy ignition and arc stability. |
| WP (green) | 2 | 96 | Clean W without alloying additives | Welding with alternating current Al, Mg and their alloys. Satisfactory zeigeist arc. Sufficient service life. |
| WP (green) | 2.4 | 66 | Clean W without alloying additives | Welding with alternating current Al, Mg and their alloys. Satisfactory zeigeist arc. Sufficient service life. |
| WP (green) | 3 | 42 | Clean W without alloying additives | Welding with alternating current Al, Mg and their alloys. Satisfactory zeigeist arc. Sufficient service life. |
| WP (green) | 3.2 | 37 | Clean W without alloying additives | Welding with alternating current Al, Mg and their alloys. Satisfactory zeigeist arc. Sufficient service life. |
| WP (green) | 4 | 24 | Clean W without alloying additives | Welding with alternating current Al, Mg and their alloys. Satisfactory zeigeist arc. Sufficient service life. |
| WP (green) | 5 | 15 | Clean W without alloying additives | Welding with alternating current Al, Mg and their alloys. Satisfactory zeigeist arc. Sufficient service life. |
| WY-20 (dark blue) | 1.6 | 151 | 1.8−2.2% (yttrium oxide) | Constant welding current for the most responsible compounds. Easy arc ignition, long service life. |
| WY-20 (dark blue) | 2 | 96 | 1.8−2.2% (yttrium oxide) | Constant welding current for the most responsible compounds. Easy arc ignition, long service life. |
| WY-20 (dark blue) | 2.4 | 66 | 1.8−2.2% (yttrium oxide) | Constant welding current for the most responsible compounds. Easy arc ignition, long service life. |
| WY-20 (dark blue) | 3 | 42 | 1.8−2.2% (yttrium oxide) | Constant welding current for the most responsible compounds. Easy arc ignition, long service life. |
| WY-20 (dark blue) | 3.2 | 37 | 1.8−2.2% (yttrium oxide) | Constant welding current for the most responsible compounds. Easy arc ignition, long service life. |
| WY-20 (dark blue) | 4 | 24 | 1.8−2.2% (yttrium oxide) | Constant welding current for the most responsible compounds. Easy arc ignition, long service life. |
The electrode WL-20 (W + 2,2% La2 O3) easy burning of the arc and re-zeigeist, stable arc, without tendency to burn-through. The mixture of La2 O3 increases the load carrying capacity of the electrode is 1.5 times the maximum current when welding with alternating current. Lanthanum electrodes in comparison with WC-20, WT-20 (a mixture of cerium and thorium) is more durable, with less wear of the working end and minimum contamination of the weld. Uniform distribution of La2 O3 in the electrode, retains its original sharpening when welding at any current. Alternating sinusoidal current requires a spherical sharpening of the working end of the electrode. WC-20 Admixture to the tungsten to 2.2% oxide CeO — the most common non-radioactive rare-earth element facilitates the initial arc starting and improves the emission of the electrode and increases the maximum welding current. Such electrodes can be welded in all characteristics of current. From WC-20 more stable arc even at low voltage. WC-20 is used for orbital pipe welding, welding sheet steel and piping. Is considered a disadvantage that the welding with large values of the current oxide of SEO is concentrated at the working end of the electrode.
Table 2. The optimal value of the current for the tungsten electrodes when welding argonautes
| Ø electrode mm | Straight polarity | Reverse polarity | The positive and negative half-cycle is equal to | Half wave negative more positive |
|---|---|---|---|---|
| 4 | 400 — 500 | 40 — 55 | 200 — 320 | 300 — 400 |
| 3.2 | 250 — 400 | 25 — 40 | 160 — 250 | 225 — 325 |
| 3 | 220 — 350 | 20 — 35 | 140 — 230 | 200 — 300 |
| 2.4 | 150 — 250 | 15 — 30 | 100 — 180 | 140 — 235 |
| 2 | 100 — 200 | 12 — 25 | 70 — 130 | 80 — 160 |
| 1.6 | 70 — 150 | 10 — 20 | 60 — 120 | 70 — 150 |
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