There are two types of welding: namely Gas welding and Arc welding.
Under the category Gas welding, there are two methods that can be classified as subcategories. First among these is oxyacetylene welding, which is the joining of two metals using the flame of an oxyacetylene torch , filler metal can be used for thicker steel, though this method is usually used for thin metals not exceeding 3mm in thickness. If a filler rod is used it is the same material and composition as the base metal.
Brazing is another subcategory of gas welding, using the oxyacetylene flame, a brazing rod and brazing flux, similar as well as dissimilar metals can be j