Acetylene is a flammable gas composed of two carbon atoms and four hydrogen atoms, with the chemical formula C2H2. It is commonly used in welding and soldering processes, as well as for producing light. The term ETHYNE (6 letters) is another name for acetylene, while OXY (3 letters) is short for oxygen, which is often used in combination with acetylene for welding and soldering. WELDING (7 letters) is the process of joining two pieces of metal together using heat, and WELD (4 letters) is the name for the joint created by this process. WELDS (5 letters) is the plural form of WELD, and SOLDER (6 letters) is a type of metal alloy used to join two pieces of metal together. Finally, WELDED (6 letters) is the past tense of welding.