Metal structures are used in all industries, but, unfortunately, not every product can be cast in the oven or in the form.A ready-made parts is not always convenient to connect or threaded studs.For such cases, and need welding (or welding connection) - a reliable process connection made of metal, which is based on the interatomic connections.Classification and types of welding very much, but basic - three of them, which can be isolated in a separate large groups.This mechanical method, thermal and integrated - thermomechanical.Mechanical welding different parts molding compound or explosion, ultrasound, friction.Thermal welding - a plasma method, an electric arc, laser, electron beam and the like.
Characteristics of welding and thermal welding
Almost every type of heat welding involves the use of special wire.In arc welding, welding wire is incorporated into the electrode, in all other cases, the wire is present as a separate component supplied to the welding site.It may have a different diameter and material - each needs its own base metal wire with special technical characteristics that meet the requirements of the welded joints.
Repair or rebuild worn parts during the operation can be carried out by welding - application to the ground off or compressed part of a new layer of metal.Usually deposition using the same metal, but this condition is not mandatory.Sometimes, especially with a view to improving the mechanical properties and performance characteristics for the welding wire to take another different chemical composition.For example, excavator bucket teeth are made of a durable metal with a high content of carbon.
welded joints: welding wire marking
marking makes it easy to determine which wire to use for a particular type of welding.The first number is the diameter and type of lettering mark metal (alloying element).The letters "CB" means "welding wire" and reaching for their figures - the proportion of carbon in the letter protsenta.Iduschaya 0.01 figure - is the percentage of the alloying element in the composition of the wire.The alloying elements are indicated: A - nitrogen, B - Nb, In - tungsten, T - manganese, D - copper and K - Cobalt, M - molybdenum, N - Nickel, P- phosphorus, C - silicon, T - titanium, F -vanadium, X - chrome, Yu - aluminum.Then, the numeral of the percentage of this element in the wire.However, when the percentage is less than one, do not put a figure.For example, welding wire communication 08G2S, wherein the content of carbon - 0.08%, about 2% manganese and less than 1% silicon.
