fakers at work

[RCS]

When you gas weld or Tig weld the relief cut, most of the time you will get a halo around the area refilled. This will show the discoloration even more when refinished. Kind of like the guys that removed the 7th round welding correction in the early receivers, the circle of discoloration still shows up !

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[jmoore]

When you gas weld or Tig weld the relief cut, most of the time you will get a halo around the area refilled. This will show the discoloration even more when refinished...!

Which would also be a sign that the part received no post-weld heat treat. That halo (or adjacent) is likely glass hard and brittle. Not too good for durability in a stressed area...