corner joints. Lap joints are two pieces that are end-over-end and welded together whereas butt welds are put end to end and connected that way. Butt welds are connected to each other with the thickness of the parent metal. There are many different kinds of butt welds such as square, single v, double v, single bevel, double bevel, single u, double u, single j, and also a double j. Minimizing the distortions in a weld is important however doing so will minimize the chances of full penetration. In order to get full penetration double welds such as double v, double j, and double u may be used. Standards EN 1993-1-8, which covers the design of joints in the design of steel structures, defines a set of provisions for welding structural steel. See also Fillet weld - a weld of approximately triangular cross section joining two surfaces at approximately right angles to each other Plug weld Flare groove weld Weld access hole Welding joint - a joining process that produces a coalescence of metals (or non metals) by heating them to the welding temperature, with or without the application of pressure, or by pressure alone, and with or without the use of filler metals References Welding