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.But welding is a commonly used technique in welding that can either be automated. Welding is used everywhere today whether it is to make a small device or to make a big airplane. Wherever two or more metals are interconnected. When done in commercial welding it also reduces the cost but a double butt weld will be used to maintain the strength of the weld. Butt. To achieve specific welds in welding, then several types of joints are considered as butt joints. It is important to minimize distortions in a weld.