In the structures of the metal is crucial quality components and joints of structural elements. At present there are three basic types of connections – welded, screwed and riveted joints. All three there both advantages and disadvantages. Application concrete form compounds depends concrete constructions where connection will utilized. The most difficult and complicated is the bolt. And on the calculation and execution. Riveted joint less common than the bolt-and material-intensive and is therefore uneconomical. Although it is more convenient to install than the bolt. On currently most prevalent are welded steel. Indeed, in our time, the welding machine is in almost every sector, even privately. Welding connection designs have a number of significant advantages over the other – from the economy metal reaching order 25 percent from riveting that in turn allows alleviate whole construction by up 15%. Respectively shrinking dates works and their cost. Furthermore, welding equipment comparatively inexpensively uncomplicated and possesses high productivity. Welds leakproof and reliable. But all enumeration advantages given kind compounds force limited volume pages on her simply not fit. Welding metalwork performed using different kind welds differing by length size cathetus welding and type – gusset or lapped. Determined parameters seams peculiarities constructions welded elements primarily thick. Manufacturers of steel welded to distinguish the works of many signs of welded joints – butt, lap, joint (Heightened overlays) angular and more. But all in a short note is impossible to list. When welding, especially when hand is always possible to determine the defects that should be monitored only by visual control methods.