If you are tig welding copper buy oxygen free copper.
How to weld copper sheet.
The filler will liquify and mix in with the two copper helping the metals weld together.
Add filler into the puddle.
The weld should be started at some point away from the end of the joint and welded back to the end with filler metal being added.
The most common type of welding for copper is the manual metal arc process but gas metal arc and gas tungsten arc are also used.
152 4 to 304 8 mm away from the weld.
Buy the right copper.
Apply the filler by gently probing it into the pudding as the arc welds the copper together.
A twelve step guide step 1.
How to tig weld copper.
Some grades of copper have oxygen.
You should also know when not to weld copper because soldering or brazing are often better methods depending on the type and use of the copper.