Gas welding (GMAW) is a kind of erw pipe. Its protection against the noble gases will take better effect. If the spiral submerged arc, the arc welding under water Sun.
EFW electric welding Electric fusion welding is the first letter of the acronym SAW (SAW) - Electric Fusion (EFW) of a kind, that is, through one or more parts of electrode, metal parts of the work-all from the electrode. Requires hot dipped galvanized pipe weld heat treatment online or offline, so that weld zone microstructure refinement, quality ERW pipe weld and base metal can reach the same level of toughness
The weld is not filled with other ingredients, by high-frequency current skin effect and proximity effect, so that instantaneous heating plate edge to the welding temperature. ERW, which is short of Electric resistance welding, initiated the first letter of the abbreviation. ERW tube and pipe welding submerged arc significantly different, there is no filler metals used in pressure welding.
Today in the manufacturing field of steel, there are three options: GMAW pipe, EFW tube and ERW pipe. These three options have their own characteristics, which have their advantages and disadvantages. The above is the comparison of these three kinds.
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