When using a MIG or Flux Core welder, a quick one-second zap should produce a good
tack weld.
The handguard ring would not come off because of the
tack weld on the bottom of the barrel.
Just about every weld except a quick
tack weld should be inspected visually," he says.
Tack weld a collar stud (3/8-16UNC-2A x 1-3/8 L (MIL-S-24149/1-542), NSN 9Z 5307-01-225-7814) to the support leg closest to the vibration switch bracket.
As long as
tack weld correspond of the local heat treatment, the higher temperature level leading to some transformations in the material structures associate with elongations which can varying from one point to other point in the heated zone.
All you need to do is bolt and
tack weld the pieces together.
For these specimens, a
tack weld (for alignment) was applied and then wrapped with the composite material.
Now line up the tapped hole in the lower cap with the hole in the leg of the 6" beam with a welding rod, and
tack weld it to the beam.
Tack weld the cut off ends to form a "V" to the size desired.
We had six guys welding full out in two assembly lines; one to
tack weld, one to weld the stainless steel boss to the mounting bracket, and the third guy welded the hardened steel fin to the boss.
Now
tack weld to the jaws, clean off the
tack welds and finish welding,(Photo 4).
The weld penetrates into the continuous
tack weld backing.
