This produces a joint which is much stronger than a butt joint without reinforcement. This is the most common form of the butt joint in building construction. This form of butt joint is rarely used in furniture making. The biscuit reinforced butt joint is a fairly recent innovation in butt joint construction. The screwed butt joint is common in both frame and carcase joinery. The most common joints used are the butt joint or mortise and tenon. The butt joint is a very simple joint to construct. The simplest joint design in most processes, spin welding included, is a butt joint. Butt joint is one of most common weld configurations used with energy directors.