SMAW electrode is solid stick-type (short-length and small-diameter rod type electrode). Shielded Metal Arc Welding (SMAW) is one fusion welding process where electric arc is established between a consumable stick electrode and the base metals. This flux can be delivered in different ways – sometimes with the electrode, sometimes separately. A part of the flux sometimes melts to produce liquid slag that also protects the weld bead. In flux shielding, the flux ingredients disintegrate to produce fume/smoke surrounding the welding zone.
In gas shielding, appropriate inert (sometimes mixed with active gas) is delivered surrounding the arc to create a gaseous barrier between the welding zone and atmospheric air.
This shielding can be either gas based or flux based. For such purpose, suitable shielding is provided. Regardless of electrode type, the hot welding zone is always required to protect from atmospheric gases (especially oxygen). On the contrary, a non-consumable electrode does not melt due to arc heat. Such electrodes that not only assist in arc formation but also supply filler metal are called consumable electrode. For few arc welding processes, the electrode is allowed to melt and subsequently deposit on the weld bead to supply filler metal. Here the electric arc is established between an electrode and the base metals when sufficient potential difference is applied across them. A sub-group of fusion welding where electric arc is used to supply necessary heat for melting the faying surfaces of the base metals is termed as arc welding.
0 kommentar(er)
