Longitudinal Submerged Arc
Welding (LSAW)
Longitudinal Submerged Arc Welding is the type of
welding basically used for pipe which
manufactured with weld. This is a
specific welding technique used in pipe production. Production from
longitudinal submerged arc welding is required high high wall thickness due to
high internal and external pressure. The longitudinal Submerged Arc Welding is
popular welding process used for longitudinal seam welding of large diameter
pipes . This process also called as LSAW.
The
longitudinal Submerged Arc Welding find their application in Oil lines, gas
lines, water supply etc.
Steel
pipes is long and hollow tubes used basically to transfer product from one
location to other. The transportation of product from one location to another
by with help of pipes which pipes mainly consisting two types, one is seamless
pipes and othe welded pipes. During manufacturing of both of the pipes steel
cast into more workable from hot billet or slab . By stretching the hot
billet into a seamless pipes . For
transporting large quantities of hydrocarbons over long distances, longitudinal
submerged arc welded (LSAW) pipes have been used for decades.
When we
required high wall thickness due to high internal or external pressure the most economical process is The
longitudinal Submerged Arc Welding (LSAW).
The ERW (Electric Resistance Welding)
differ from LSAW (The longitudinal Submerged Arc Welding) is that the LSAW type
used for large diameter size of pipe as compared to ERW process. The LSAW type
process used for pipe having diameter 16 inch. To 60 inch, low temperature
resistance. Also Double
Submerged Arc Welded (DSAW) steel pipe is available in straight and spiral
welded formats and used in a variety of applications
The material used for LSAW type process is
heavy or middle thickness sheet which coiled in forming machine and welded by
The longitudinal Submerged Arc Welding.
In the longitudinal Submerged Arc
Welding. Hot rolled coils used to formed the steel pipes by bending and welding
process.
The typical example of production of
longitudinal welded large diameter pipes as shown below,
Firstly Longitudinal edges of steel plates beveled using carbide milling equipment , after that beveled plates formed into U-Shaped press subsequence into o Shape using O-Shaped press the whole process shown below,
Pic.01
The inspection
purpose in LSAW Welding is to check Chemical analysis, Flattening Test Bending
Test X-Ray testing, Yield Strength, Ultimate Tensile Test, Hydrostatic Test
etc.
The photograph of pipes manufactured by LSAW
(longitudinal Submerged Arc Welding) as shown below,
Pic.02
Specification : ASME B16.25 covers the preparation of butt weld
connections between pipes and ASME B16.49 covers the marking details.
Advantages : contamination of impurities in the air is
protected by this type of process.
welds would penetrate 100% of the pipe wall and formed very string bond this is main advantage of LSAW process.
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