TIG-Welding: Efficient welding
TIG welding is usually used when the welding quality requirements are high or the material thickness is particularly low. In this case, the production of the weld material is often low and the welding speed does not grow to a large figure. TIG welding can, however, be enhanced in a variety of ways.
The melting power can be increased by integrating the wire feeder into the torch or by moving from cold wire technique to hot wire technique. The production of the weld material may increase by up to 200% when moving to hot wire welding. In the cold wire technique, the melting of the filler material commits part of the effect of the arc and reduces the production of the weld material. In the hot wire process, however, the filler material wire is heated with a separate power source and the production of the weld material increases.
Using activating paste improves welding speed and increases the penetration. When activating PATIG paste is spread on the weld spot, the area of the arc becomes smaller and the density of the current in the anode point increases by 150% to 200%. The paste is comprised of a powder and binding acetone that can be spread with a brush or as a spray. The applications include sheet wheels, pressurised containers and material thicknesses 3–12 mm (I groove with one burn).
The selection of the shielding gas can affect the fusing and penetration of the basic material. The most commonly used shielding gas in TIG welding is Argon. Its benefits are its low price and good shielding effect combined with the ignitability of the arc. Its weakness is its poor thermal conductivity and the subsequent potential problems in the smooth fusing of the weld. The fusing can be improved by adding 5–25% hydrogen to the shielding gas. This will also reduce the area of the arc and increase the penetration.
Using helium as the shielding gas allows for good merging of the filler with the basic material and produces good penetration. However, its weakness is in the poor ignitability of the arc. This can be improved by using a mixture of helium and argon.
The melting power can be increased by integrating the wire feeder into the torch or by moving from cold wire technique to hot wire technique. The production of the weld material may increase by up to 200% when moving to hot wire welding. In the cold wire technique, the melting of the filler material commits part of the effect of the arc and reduces the production of the weld material. In the hot wire process, however, the filler material wire is heated with a separate power source and the production of the weld material increases.
Using activating paste improves welding speed and increases the penetration. When activating PATIG paste is spread on the weld spot, the area of the arc becomes smaller and the density of the current in the anode point increases by 150% to 200%. The paste is comprised of a powder and binding acetone that can be spread with a brush or as a spray. The applications include sheet wheels, pressurised containers and material thicknesses 3–12 mm (I groove with one burn).
The selection of the shielding gas can affect the fusing and penetration of the basic material. The most commonly used shielding gas in TIG welding is Argon. Its benefits are its low price and good shielding effect combined with the ignitability of the arc. Its weakness is its poor thermal conductivity and the subsequent potential problems in the smooth fusing of the weld. The fusing can be improved by adding 5–25% hydrogen to the shielding gas. This will also reduce the area of the arc and increase the penetration.
Using helium as the shielding gas allows for good merging of the filler with the basic material and produces good penetration. However, its weakness is in the poor ignitability of the arc. This can be improved by using a mixture of helium and argon.
Labels: TIG-Welding Efficient welding
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