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Sustainability in Joining
Published in R. Ganesh Narayanan, Jay S. Gunasekera, Sustainable Material Forming and Joining, 2019
In gas welding (or flame welding), various fuels are combined with oxygen to generate heat required for welding. The fuels used are acetylene, methylacetylene-propadiene, hydrogen, propylene, and propane. If acetylene is used, which is predominantly the case; it is called oxyacetylene gas welding. Filler rod is not mandatory, but if used, it is coated with flux responsible for protecting weld pool from atmosphere. In oxyacetylene gas welding, combustion occurs in two stages. In the first stage, the products are CO and H2, which further undergoes reaction in the second stage, resulting in CO2 and heat generation. The combined heat generated is about 50 × 106 J/m3 of acetylene. In gas welding, the important sustainability and green contribution to the process comes in the form of fuel (e.g., acetylene or propane) and the type of flame (e.g., neutral or reducing or oxidizing) used for combustion. Methods of storing acetylene and materials for hoses are also crucial. The combination of acetylene and oxygen is highly flammable, and hence oxyacetylene welding is not eco-friendly and unsafe for workers.
Health and safety
Published in Roger Timings, Fabrication and Welding Engineering, 2008
Oxy-acetylene weldingState how you would distinguish between oxygen and acetylene cylinders.List THREE important precautions that should be taken when handling welding gas cylinders.Explain briefly how to test for leaks in oxy-acetylene welding equipment.Explain briefly the fire and explosion hazards associated with oxy-acetylene welding equipment and how such hazards can be avoided.Describe what essential protective clothing and equipment should be worn when oxy-acetylene welding and flame-cutting.
Manufacturing Products
Published in Roger Timings, Basic Manufacturing, 2006
Oxy-acetylene welding is a process in which the heat for welding is produced by burning approximately equal amounts of oxygen and acetylene. The gas is stored in cylinders and is fed via gas regulating valves, to a blowtorch. The welding flame produces a temperature of approximately 3500°C and this is sufficient to melt the filler rod, and the edges of the metals to be joined. Oxy-acetylene welding is a manual process widely used in the engineering, fabrication and automobile industries on metals such as carbon and alloy steels, cast iron, aluminium and aluminium alloys, brasses and bronzes. The gas is very expensive compared with electricity and the heat energy available is limited. Therefore gas welding is limited to sheet metal and thin plate work. The equipment and principle of oxy-acetylene welding is shown in Fig. 3.41. A flux is rarely needed when oxy-acetylene welding since the products of combustion of the oxy-acetylene flame form a blanket over the weld pool and prevent atmospheric oxidation.
Performance, combustion and emission analysis of internal combustion engines fuelled with acetylene – a review
Published in International Journal of Ambient Energy, 2022
Sumit Sharma, Dilip Sharma, Shyam Lal Soni, Digambar Singh, Amit Jhalani
Acetylene is an explosive and colourless gas with a distinctive odour. As a result, special safeties are necessary during their production, handling, and burning. The generally acetylene has been used as a raw material for the production of various organic chemicals, which are widely used in the preparation of polyester and polyurethane plastics. It is being used as the fuel component in metal cutting and oxy-acetylene welding. Some commercially useful acetylene compounds such as acetylenic alcohols, which are used in the synthesis of vitamins and acetylene black, which is used in certain dry-cell batteries. Presently, acetylene is being used in I.C. Engines.