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Bridge wire plasma arc welding material

1) base metal argon arc welding to welding of materials are available in plasma arc welding, such as carbon steel, heat-resistant steel, Meng Naili < alloy Kovar alloys, titanium alloys, copper alloys, aluminum alloys and magnesium alloys.
&Nbsp;  addition to aluminum, magnesium and their alloys, and remaining material using DC method welding: aluminum, magnesium and their alloys using AC or DC reverse weld. Single-channel DC plasma arc welding material thickness range is generally 0.3-6.4mm. Single Exchange of variable polarity plasma arc welding aluminium thickness up to 12.7mm (small hole).
&Nbsp;  metallurgical process of plasma arc welding and Tig welding the same only by the plasma arc column with small diameter, welded base metal when melting less, so the large weld depth to width ratio, narrow heat-affected zone. Each base metal during welding after preheating, heat, and gas processing and welding the same.
&Nbsp;  (2) filled with Argon arc welding, plasma arc welding filler metals can be used. Padding made of metal wire or rod. Automatic welding using flux-cored wire for filler metal, manual welding filler metal electrode is running out. The main ingredients of filler metal and weld the base metal of the same.
&Nbsp;  (3) gas-plasma welding torch there are two layers of gas, of ions that flow out of the nozzle and from the protection Hood out of gas. Sometimes, in order to enhance the protection, the need to use protection covers and ventilated back pad to expand protection of the scope of protection. On tungsten electrode should be inert; avoid tungsten burn protection is generally inert gas on parent material, but if such depend on welded metal, alternative gases are:
&Nbsp;  1) Ar Ar gas used in welding of carbon steel, high-strength steel and reactive metals like titanium, tantalum and zirconium alloys. Of these used metal gas welding, even a very small amount of h, can also cause weld porosity, cracks or reduced mechanical properties.
&Nbsp;  2) mixed gas welding Ar-H2 austenitic stainless steels, nickel alloys, and copper-nickel alloys, allows the use of Ar-H2 gas mixture.
&Nbsp;  added H2 in Ar gas can increase the arc temperature and electric field strength of arc, capable of more effectively transfer arc heat to work, given current conditions have higher welding speed. Meanwhile, the H2 has reduced, with a Ar-H2 mixture gas can get more luminous the weld appearance. But excess H2 weld porosity and cracks appear, φ (H2) at 7.5%. However, in Keyhole welding process, due to the escape of gas in order to fully, and φ (H2) range from 5% or 15%, thicker workpieces, allow larger H2. Such as small holes when welding stainless steel 6.4mm, and φ (H2) for 5% and 3.8mm stainless steel pipe welded at high speed that allows the φ (H2) up to 15%. "Using Ar-H2 gas mixture. When the mixed gas plasma gas, arc at a higher temperature, nozzle diameter rated current should be reduced.
&Nbsp;   3) Ar-He gas-mixture He kind of inert gas, when the work piece is not allowed when using a Ar-H2 mixture, consider using Ar-He mixture. In Ar-He mixtures, φ (He) over 40% arc heat to significantly change. Φ (He) exceeds 75%, the performance of basic and pure He same, usually joined PHI in Ar gas (He) =50%~75% holes of titanium, aluminium and its alloys welding and weld bead on all metals. BACK