Hi Experts,

I am welding a PTA overlay of - Colmonoy 42-P2 Powder on a Cast iron glass mould. We are facing a problem of porosity. We have taken care of cleanliness, quality and quantity of shielding gas etc. Will be glad to read suggestions on eliminating the porosity.

Parameters are

Current 63 amps

Volts   24 V

Pre Heat Temp 450 C

Chemical composition of Cast Iron

C            3.55        ± 0.10

Mn         0.6          ± 0.10

Si             2              ± 0.20

P             < 0.10    ± 0.20

S              < 0.10    ± 0.20

Cr            < 0.10    ± 0.20

Ni            < 0.10    ± 0.20

Mo         0.45        ± 0.05

V             0.13        ± 0.03

Ti             < 0.10    ± 0.03

Ceq.       4.15        ± 0.10

Chemical composition of Powder

Boron    1.64

Carbon 0.37

Cobalt   0.10

Chromium           10.00

Iron        2.48

Nickel    Balance

Silicon   3.07

Suggestions most welcome. Thanks in advance.

S. Vignesh

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