Definition: The LSAW steel pipe body has one longitudinal weld, and two welds are allowed when the diameter is greater than 914mm.
Welding wire is used to weld the submerged arc filler. The submerged arc straight seam steel is referred to as ASWL, and the weld is protected by flux.
The biggest feature of arc straight seam steel pipe is the use of arc hot melting with external welding wire and the use of submerged arc flux. Using JCOE steel pipe forming, one weld seam, submerged arc welding process, specifications range from 325mm--1420mm.
Difference: The differences between HFW and LSAW steel pipes mainly include the use of different raw materials, different production processes, different welding processes, different production units, and different production scopes.
LSAW steel pipes are produced with the narrowest 1250mm coil plate, medium plate and medium thick plate as raw materials. HFW steel pipes use strip steel with a maximum width of 1500mm as the raw material. Strip steel is lower in cost.
The forming process of LSAW steel pipe is 1COE cold stamping, which is characterized by gradually forming the steel plate in units of 50mm. J, C, 0, and E vividly represent the forming process of submerged arc straight seam steel pipe.
The HFW steel pipe forming process is a cold forming process with multi-pass rollers, squeezing both ends of the strip, and finally aligning both ends of the strip. It is characterized by uninterrupted forming process and continuous welding.
Process Characteristics: It is to use the electrothermal effect of the welding wire to heat-melt the steel plate together to weld the filler. The characteristic of the HFW steel pipe welding process is that the high-frequency skin effect of the current is used to cause the two ends of the strip to heat up sharply in a short period of time, causing the strip to self-melt together under the action of external force.
The HFW steel pipe production unit is an uninterrupted production line with the same efficiency as the assembly line, while the submerged arc welding straight seam steel pipe has a complete set of intermittent production units with up to 15 processes. HFW steel pipes have fewer production specifications and thinner production thicknesses.LSAW steel pipes can be produced in any specifications from 325 to 1600 mm and in any thickness up to 80 mm.
