Quality Welding To get a reliable connection, it is necessary to ensure similarity mechanical properties and, most importantly "full strength" materials to be welded and the weld is achieved by correct selection of the electrode. In this important part of the core and the coating. Often the required steel is formed by the interaction melt and alloying additions. If you are working melts the electrode, picked his mark, if in an inert environment – the filler wire. When bad combination of materials seam is unstable or do not, cracking during cooling. Argon-arc welding (TIG) occurs in the inert gas argon (Ar). Usually use non-consumable tungsten electrode and the consumable filler wire in a convenient form of segments of length.
Gas is supplied from a special container. In addition to argon, helium is used (He) or a mixture of these gases. Method is highly versatile, high-quality weld seam and allows very fine details. Disadvantages – awkwardness equipment and difficulty of working outdoors, where the necessary measures against the blowing gas protection. Provides the best quality of argon, helium has the worst qualities – a drop of melt in its midst heavily sprayed. SEMI-AUTOMATIC welding in CO2 (MIG) Allows you to replace the piece electrode wire of solid section. Carbon dioxide is good when you do not need a very high quality, as it slightly reduces the strength properties of steel and leads to its spattering. Most important advantage of the method – the cheapness of materials. Compared with CO2 uniqueness of argon that the relatively low current (200 A), it allows for spray transfer of metal characterized by a high utilization factor (the ratio of the masses caught in the seam of the metal to the mass consumed) – 0,8-0,85.