Traditional method (AWS specification):
- Remove mill scale completely from the surface and clean (lot of labor & time involved)
- Preheat or Interpass Temperature Control
- Weld
- Remove weld scale
- Clean weld spatter
Quality Problems:
a) Weld starts rusting quick (even if it is blasted or sanded later on) which affects adhesion
(bonding) with top coating
b) AWS spec requires all weld to be tested (NDT) for failure (crack inside), which happens
because of hydrogen embrittlement. All failures require re-work.
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Picklex® 20 Process:
Process: Note: The mill scale does not have to be removed
- Just spray or brush Picklex® 20 on the metal surface.
- In about a minute, wipe off to remove the excess Picklex® 20 from the metal surface.
- Heat dry by a heat gun or air dry & perform Welding
Performance/Benefits of Picklex® 20:
a) Picklex® 20 completely converts the mill scale to a conversion coating through which
welding can be performed after complete drying. This eliminates removal of the mill scale.
b) Weld strength is still higher than the AWS method.
c) Does not cause hydrogen embrittlement and so the chances of weld failure is almost
zero, which means almost no re-work, saving a lot of labor, time & cost. There has been zero
welding failure since 1998 (no re-work, saving a lot of labor, time & cost)
d) Acts as an anti-spatter saving labor & time
e) After welding and removal of the weld scale, spraying Picklex® 20 on the welding area
provides a long term indoor rust protection before top coating
f) Provides much better adhesion of the welding area with the top coating
g) Saves a lot of labor, time & cost
To provide maximum rust protection and also provide good bonding with the top coating remove the weld scale by a wire-brush and spray the welding area with Picklex® 20 .
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