ERW namely resistance welding Electric hold welding the abbreviation of the first letter of the ERW carbon steel pipe with submerged arc welding pipe welding way have significant difference, is without the pressure of the filler metal welding method, welding seam, not fill other ingredients in skin effect by the high frequency current and near effect, make the edge instant heating to welding temperature, formed by squeezing roller extrusion forging welding seam of the organization. High quality steel pipe require the use of online or offline weld heat treatment, thus refine welding area organization, high grade ERW welded steel pipe weld can reach the same as the parent metal toughness, it is out of reach for submerged arc welding process.
EFW namely Electric welding Electric fusion welding of the abbreviation of the first letters Submerged arc welding (SAW) - a kind of electric welded (EFW), is by one or a few consumable electrode and workpiece between the metallic heating combination between the metal in a process, the arc melted metal and the filler material fully, do not need to pressure, filler metal part work makes all come from the electrode. Melting gas shielded arc welding (GMAW), a kind of electric welded (EFW), the process is similar to submerged arc welding, but it is from the inert gas protection, the effect will be better. Spiral welding - this is one of the submerged arc welding, with a spiral weld structural steel pipe.
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