Editing Acetylene (section)

===Welding===
Approximately 20% of acetylene is supplied by the [[Industrial gas|industrial gases industry]] for [[oxyacetylene]] [[gas welding]] and [[Oxy-fuel welding and cutting|cutting]] due to the high temperature of the flame. Combustion of acetylene with oxygen produces a flame of over {{convert|3600|K|C F}}, releasing 11.8&nbsp;[[Kilojoule|kJ]]/g. Oxygen with acetylene is the hottest burning common gas mixture.<ref name=Linde2013>{{cite web |url=http://www.linde-gas.com/en/products_and_supply/gases_fuel/acetylene.html |title=Acetylene |access-date=2013-11-30 |publisher=Linde |website=Products and Supply > Fuel Gases |archive-date=12 January 2018 |archive-url=https://web.archive.org/web/20180112184128/http://www.linde-gas.com/en/products_and_supply/gases_fuel/acetylene.html |url-status=live }}</ref> Acetylene is the third-hottest natural chemical flame after [[dicyanoacetylene]]'s {{convert|5260|K|C F}} and [[cyanogen]] at {{convert|4798|K|C F}}. [[Oxy-fuel welding and cutting|Oxy-acetylene welding]] was a popular welding process in previous decades. The development and advantages of [[arc welding|arc-based welding processes]] have made oxy-fuel welding nearly extinct for many applications. Acetylene usage for welding has dropped significantly. On the other hand, oxy-acetylene welding ''equipment'' is quite versatile – not only because the torch is preferred for some sorts of iron or steel welding (as in certain artistic applications), but also because it lends itself easily to brazing, braze-welding, metal heating (for annealing or tempering, bending or forming), the loosening of corroded nuts and bolts, and other applications. [[Bell Canada]] cable-repair technicians still use portable acetylene-fuelled torch kits as a [[soldering]] tool for sealing lead sleeve splices in [[manhole]]s and in some aerial locations. Oxyacetylene welding may also be used in areas where electricity is not readily accessible. Oxyacetylene cutting is used in many metal fabrication shops. For use in welding and cutting, the working pressures must be controlled by a regulator, since above {{convert|15|psi|abbr=on}}, if subjected to a shockwave (caused, for example, by a [[flashback (welding)|flashback]]), acetylene [[decompose]]s explosively into [[hydrogen]] and [[carbon]].<ref>[http://www.esabna.com/euweb/oxy_handbook/589oxy3_3.htm ESAB Oxy-acetylene welding handbook – Acetylene properties] {{Webarchive|url=https://web.archive.org/web/20200510192947/https://www.esabna.com/euweb/oxy_handbook/589oxy3_3.htm |date=10 May 2020 }}.</ref>

[[File:Laskarbit.jpg|thumb|200px|Acetylene fuel container/burner as used in the island of [[Bali]]]]