Stainless steel is a class of materials that can be characterized as a metal iron-based alloys with at least 12 percent chromium. They have some resistance to oxidation due to the protective outer layer of chromium oxide, and the term "stainless steel" does not identify a specific type of metal can not be used for any practical purpose. Here, how to weld several large families of stainless steel.
Austenitic stainless steel welding. These steels are usually welded by most of the low thermal conductivity and high coefficient of expansion compared to the other stainless steels. These properties produce more distortion during welding and require special strategies, including a base metal with low carbon base metal with titanium or niobium or solution heat treatment.
Ferritic stainless steel identified by their ferromagnetism and inability to be hardened by heat. These stainless steels are welded with austenitic or ferritic filling material using arc processes, but the heat treatment may be required after the welding.
Consider a mixture of stainless steel austenitic and ferritic properties to be Duplex steels. The most important of these steels is the factor limiting the welding time at temperatures of 300 to 980 degrees Centigrade in order to minimize the degradation of their properties.
Analysis of martensitic steels by their magnetism and ability to be fully hardened by heat. These steels are not readily weldable. Best results can be achieved with very low carbon machining the base metal and heat before and after the welding.
Use exact instructions for welding hardenable stainless steel. This class of metal is easily welded, if the heat treatment is performed.
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Arc welding apparatus are designed to weld metal together with a consumable welding rod. When the electrode is held in the holder it is placed near the base of grounded metal, high-amperage electric arc across the gap between the surfaces. The resulting arc generates sufficient to melt as consumable electrode metal and heat. The two molten metals then puddle together, and when cooled, form a permanent homogeneous joint between the two surfaces. In addition, by using special cutting rods and the right technique, you can also use an arc welder to cut through the ferrous metal.
Prepare the welding machine by inserting both the base and the welding rod handle lead into their respective color-coded on the side of the machine. Adjust the welding current to the highest position.
Mark a clear line on a steel or cast iron with a piece of engineer's chalk.
Holding the bare end of the rod in a special groove cut into a front side of the welding arm so that the pin protrudes in front of the right arm. Don a pair of welding gloves and welding protective mask slip over your head, not down the visor.
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