How
to Use Dissolvo Purge Dams for TIG Welding |
| Click
here to download a PDF version of this instruction sheet |
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| For small diameter pipes
(less than 4" inner
diameter), simply position a wad of Dissolvo paper several
inches down into each section to be joined. |
For larger pipes (4" inner
diameter and larger), cut the paper into a circle with
a diameter several inches larger than the pipe ID Example: for
a 6" ID
pipe, cut an 8" diameter paper circle. |
Trace or impress the pipe inner diameter on
the paper and fold on this line to form a 90 degree lip.
Insert the dam into the pipe with the lip towards the weld
prep.
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| Peel tape from backing and tape
dam in place. Optional: Punch a small hole in the
dam to facilitate the evacuation of air when purging. |
For pipes
larger than 28" diameter,
simply splice two or more sheets of Dissolvo paper together
with Dissolvo tape, and proceed as in steps B,C, and D. |
After the dams are in place, Argon
or another purge gas may be introduced through the root gap
with a needle valve connected to the gas line.
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If one end of the pipe is accessible, the purge gas may be
introduced through a hole at the lower end of one dam. A vent
hole should be made at the upper end of the other dam to allow
air and gases to escape. Optional: cover the open root
joint on the outside of the pipe with tape to prevent gas leakage. |
 |
| Click
here to download a PDF version of this instruction
sheet |
|
|
