Welding Test

for 1" welder test : with backing ring is not easy to identify defects by visual inspection . by mean of visual inspection you can only judge only distorstion in test piece , excess capping . excess penetration and root fusion you can checked by only radiography examination.

The very reason ,they have given the consumable insert is to avoid excessive and uncontrollable (due to low travel speed) root penetration with TIG in a conventional welding 0f 1'' size bore.

There is nothing to worry, except that, you have to select proper torch angle and manipulative techniques to fuse the upper portion of the tube initially and the bottom tube will get fused automatically due to gravity flow of the filler metal.

Since the tube diameter of the tube is only 1" please make sure that, the tungsten electrode is kept more or less perpendicular during the welding. Otherwise, it will be difficult to achieve the proper fusion and penetration at restart zones.

It might be difficult for you to complete the joint in two segments due to size of the tube. You may require 3 at maximum and it will be better if you make some mock up runs (dummy) to check the torch angle and arc gap before attempting the actual test as welding a small bore tube requires practice compared to a larger size pipe.

Wishing U all the Best - Sridhar

Thanks for your support.

Ask for a few test pieces to set up the current and get familiar with the machine (as well as reduce nervousness). It is respectable IMHO for a welder to ask for sample pieces before any job. There is a chance they will give you a machine that is not setup anyways.

Verify your gas flow is set low (around 30% if argon, a little lower with a hotter gas). Set the post flow high and make sure you shield the weld area while it cools. And of course ask questions if you are unsure about their setup.

Now would a gas lens be appropriate for this setup?

Good luck.

Thanks for the info.