Welding Chromemoly

Welding Chromemoly, with the Henrob 2000

example: 4130 Chromemoly aircraft tubing

Rod: mild steel (RG-60 or Oxweld #32) bare rods only.

Tip selection: generally the #0.5 tip works well to up 045 wall thickness.

like TIG, keep tip up off of the metal

oscilate or weave to spread weld bead each piece.

with a neutral flame

walk up the rod

wash it back into the puddle

flow puddle to satisfaction

General

• This is a self-annealing weld.

• use the #00 for 26 to 28 ga.
• use the #0 for 24 to 20 ga
• use the #0.5 for 18 to 20ga
• use the #1 for 16 to 1/8"
• use the #2 for 1/8" and thicker
• the #2.5 tip may be helpfull on 3/8" and thicker

• use 4 to 4 1/2 psi on both gases
• if a 50' hose is used, increase your pressure 1 to 2 psi (see setting up the torch)

• Use a neutral or just off feather
• See setting up torch

• no flux required or recommended for chromemoly.

Rod material

• We recommend the ER70S-2 (TIG) or oxweld #32

When sizing your rod

• 1/16" for 0.030.
• 3/32" for thicker

• Move torch in slow small increments - wide oscillations are not necessary.
• Do not remove flame from metal abruptly as this may crystallize the weld.