It inner core has a feather edge extending beyond it, this white feather is also known as acetylene feather. Oxyacetylene welding, commonly referred to as gas welding, is a process which relies on combustion of oxygen and acetylene. On solidification such a weld will have pitted surface all along its length and the weld bead attains higher hardness and becomes extremely brittle due to exces­sive amount of carbon in it. Such a flame makes a loud roaring sound. The reduction in length of the inner cone is a measure of excess oxygen. Oxygen connectors are "right-handed". The bore determines the flame size, and nozzle selection is based on the thickness of the metal to be welded. other end to the torch. Just as it is done in carburizing flame, the torch is adjusted to a neutral flame. Acetylene is composed of carbon and hydrogen (C 2 H 2), and the gas burns in air with a smoky flame. OXY-ACETYLENE WELDING It is the common method of gas welding. Consequently, natural gas is the slowest for piercing. Elements in the metal begin to oxidize due to the heat of the oxygen. This flame is not used to weld regular steel. For example, a 2X carburising flame would have the intermediate feather 2 times as long as the inner cone and so on as shown in Fig. © Copyright 2019, All Rights Reserved | Studentlesson, Different types of gas welding flames and their applications, What is shielded arc welding (SMAW) and how it works, What is gas welding process, its advantages and…, What is plasma arc welding, its component and applications, Applications, advantages and disadvantages of…, What is FCAW, it applications and how it works. Report a Violation, Top 3 Characteristics of the Flame (With Diagram) | Welding, Main Variants in Gas Welding Process | Metallurgy, Cold Pressure Welding: Joint Design, Setup and Variants. Carburizing flame contains an excess of acetylene gas. Oxy-acetylene torch cutting. It normally does not affect the chemistry of the weld metal and usually produces a clean looking weld having properties comparable to the base metal. Oxy-acetylene welding is simple in concept - two pieces of metal are brought together, and the touching edges are melted by the flame with or without the addition of filler rod. It absorbs additional oxygen from air as it provides complete combustion. In this type of welding, oxy-acetylene welding applies a mixture of acetylene gas and oxygen gas to supply welding torches. If a carburizing flame is used for welding, carbon absorb from the flame, causing metals to boil. For example, in weld­ing brass zinc may fume away, however the formation of copper oxide layer on the weld pool surface prevents the loss of zinc by evaporation. The oxy-fuel welding method combines oxygen and a gas (typically acetylene) to create a very hot flame that can cut through metal. The inner cone tips temperature is approximately 3700-degree Fahrenheit. This was a … / Oxidizing 6000F. The oxidising flame has an excess of oxygen over the acetylene. TOS 7. When mixed together in correct proportions within a hand-held torch or blowpipe, a hot flame is produced with a temperature of about 3,200°C. Ron Covell Author. Required fields are marked *. A neutral flame has two zones: a hotter, lighter inner zone and a cooler, darker outer zone. A carburizing flame will produce iron carbide, causing a chemical change in steel and iron. Carburizing flame is clearly recognized by three flame zones; This flare burns with a coarse rushing sound. This temperature is more than twice the melting point of most metals. The chemical reaction between acetylene and oxygen is exothermic in nature. There are three basic types of oxy-acetylene flames viz., carburising or reducing flame, neutral or balanced flame and an oxidising flame. Find us on Amazon: https://www.amazon.com/shops/lucasmilhauptinc What is the best flame to use for brazing your products? 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