Many, many times very,very tiny 'pepper' like porosity is caused by an Argon leak in the connections, hose or torch. I have seen a TIG bead that looks very good on the surface and all of a sudden a very tiny gas pore will pop to the surface while welding. Upon grinding, removing the tiny pore, more pores will be discovered just under the surface of the 'good' bead just welded. I have seen welder go' crazy' just trying to figure it out. I will have the welder disconnect the electrical power to the TIG rig. Then I will have the welder fill a container with enough water so he can submerge the hose & connections section by section. When the bubbles come up you can isolate and fix the leak. Make sure the welder completely drys the hose, connections & torch before starting to weld. You can also use "SNOOP' a leak detection liquid or just make some soapy water & brush it on.
Sincerely,
Gene Matsko
On Saturday, July 25, 2015 12:20 PM, José Juan Jiménez Alejandro <jjjimeneza@gmail.com> wrote:
you can use the camera technique, filling your tube with argon, argon more protection with your filler, ie, argon inside and out.
2015-07-25 6:14 GMT-05:00 Vanchinath S.A. <vanchinaths@gmail.com>:
You may try argon+1.5%Hydrogen as shielding gas.On 25 Jul 2015 10:15, "Nazz A" <nazzimmm@gmail.com> wrote:--Sir I am Muhammad.
we are working here in qatar under Qatar Petroleum. We have to complete the fire line systrm through Cu Ni. We are using Tig welding and ising monel 67 CuNi filler wire. With goving back purging as Argon 99.99 % composition.
But still we arr facing the defects as porocity. We already covered the area and clean the parent metals and filler wire. Using all of materials like cutting disk wire brush clits and everything is non ferrous. Our present climate is summer here in Arabian dessert.
But in the Radiography,we cant controle the porocity here. Our all welders are wrll expetienced and well occupied. The poricity is always minor and when we cut out and checking its cant show.
Our acceptable criteria is lower than 0.6 mm.
I hope that you will give the right solution on our problem.
Yours regards...
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Ing. Jose Juan Jimenez Alejandro
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