The definition of ERW welding
ERW steel pipes are manufactured by low-frequency or high-frequency resistance. It is a method of welding done by putting two surfaces in contact to face one another, then let high frequency current release either indirectly or directly, which later heats up by resistance heating between the two contact surfaces that is pressured to connect the two.
The principle of ERW welding
1) Skin Effect: the phenomenon where the current density is concentrated in the surface of conductor when there is electric current.
2) Proximity Effect: the phenomenon where the current distribution is gathered to the nearest area when the gap of two conductors is narrow with different direction of current flow in a pair of conductors.
The characteristics and merits of ERW welding
1) High-efficiency / high-quality welding
2) High-speed welding, mass production
3) Possibility of welding for thin-wall pipe
4) Very narrow heat-affected zone for welding
5) Oxidized layer, Minimized transformation
6) Possibility to apply to various metal
Item | ERW Pipe |
Grade | STKR400 |
Thickness | 1.4 ~ 7.0 mm |
Length | 6,000 ~ 12,000 mm |
Origin | China |
Loading Country | China |
HS Code | 000000 |
Incoterms | Negotiable |
Lead Time | Negotiable |
Department | Metal 2 team |