There are plenty of different scenarios which require a skilled welder to fuse together two types of metal objects. The process of welding fuses there two objects together by causing coalescence of the objects, meaning that the objects melt, mix with another molten metal that is usually added as a filler between the two objects or structures, and cool in order to make an incredibly strong fusion between the two objects.
In Canada, most welding jobs are needed in order to create joints for structures, whether the structure be a bridge, a crane, or any other type of object or structure that is made of metal.
In order to create joints on these incredibly large pieces, welders must have the expertise that is needed to weld the structures together, sometimes many feet off the ground. After the welding process has been done, an inspection of the welding joint is made in order to ensure the stability and safety of the object or structure. If this inspection was not completed after each welding job, the object or structure that needs to be able to hold a large amount of weight could easily collapse, not only injuring the operator of the object such as a crane or the drivers who are driving across a large steel bridge, but also injuring the pedestrians or anyone else who is near to the object or structure when the welding joint breaks.
In order to properly inspect a new welding joint, a test is completed prior to fabrication, in done on a smaller scale in a controlled environment with absolutely no other people around that could possibly be hurt during the test. This test involves putting a large amount of strain on the welding joint (once it has cooled completely, of course) in order to ensure that the joint will be able to properly hold the weight that it needs to every day.
Training for welding in Canada is offered at a variety of different places, included individual trade schools that offer a welding certification to the participants.
Although formal training is completed in less than a year, a life time goes into upgrading and advancing skills and qualifications.