Welding is a high joint strength metal joining process, which, unlike the lower temperature metal joining processes, involves the melting of the base metals in order to achieve fusion between the base metals and the filler metal. A welded joint can achieve a higher strength than the base metal part, which makes it a useful joining method where component strength is a key consideration. There are many different types of welding, where the heat or pressure of joining, or the means of providing the heat or pressure differ. Which method of welding is most appropriate will depend on the materials being joined, the joint strength required, and the dimensional tolerance required of the joint.
Welding is an often used companion to repetition engineering, generally in the assembly of repetition engineered parts where part complexity prevents CNC machining of the finished product in a single operation. There are numerous means of joining components, but welding is often selected as it is a cost effective method which provides a high joint strength. There are numerous applications where a product composed of parts produced via repetition engineering would require the welding in some of the joins. Some such situations include the repetition engineering of multiple components of a single product, where component geometric complexity means the parts must be separately machined and then assembled with a high joint strength.
In these cases it is a good idea to get manufacturing and assembly done all in the one location. This reduces logistical and administrative complications and removes potential sources of part interfacing and compatibility issues.