[Corvax7]

Hey, I am a welding student in high school and I thought I could etch I one of my 1/4 inch lap welds, the etch was not super good so I outlined it in sharpie. Is this suitable for tig? are there changes I could make to make this a better weld? I would like your input.

[Coldman]

Micro is done with a microscope. Macro etch is a visual inspection. In this case the macro etch hasn't worked so we can't see anything and therefore can't make comment.

You need to do it again. Polish the joint to smooth and shiny with 400 grit or better wet and dry if you have no other mechanical means and etch with 10% nital or pickling gel. Rinse off dry and photo straight away or spray with clear or it will rust in minutes . The joint will be fully revealed for all to see.


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[Oscar]

I agree, nothing has truly been etched and drawing sharpie lines over what can't be seen doesn't help at all.

[dirtmidget33]

Here's a video that will help you etch your welds using everyday products readily available at hardware store, Wal-Mart or auto part store. Prolly should show a picture of weld along with your etch. That way everyone can give you better advice depending on what's going on.

Etching video
https://youtu.be/8DPhc5K_thg

Also this article will give you information on penetration and fusion in your weld joints.

http://www.lincolnelectric.com/en-us/su ... 20provided