Boasting 178 billion barrels of proven oil reserves and close to 58 Tcf of proven natural gas reserves as of 2009, Canada is the world's largest reserve holder after Saudi Arabia and the top supplier of U.S. energy imports. Canada is also home to the world's most expansive oil sands deposits, the development of which extracts and processes a heavy, tar-like crude bitumen that comprises the bulk of the country's reserves. Canada's oil and natural gas sector is privatized, with industry regulation occurring at the provincial level.
Welding is a type of fabrication that is used to join metals or thermoplastics together by fusion. This is done by heating and melting part of the material and often adding a filler material which when cooled will form a strong bond. Pressure may also be used to weld, with or without the application of heat.<br/>There are different methods of welding used depending on the type of materials and desired end result, and Welders must be properly qualified for the type of welding work carried out.