AMS-STD-2219 has been superseded by AWS D17.1. filler wire for 4130 would be 4130 wire (AMS 6457) or Timken 17-22AS (AMS 6458).
Dick Hovey
Transport Canada DAR #308 (Canadian equivalent to FAA DER)
Powerplants & Structures (Materials & Processes
Talk with Praxair's Airfoil Management Division. They'll give you lots of background. They do a lot of the world's compressor blade refurbishment, restoring L/E radii and profile.
For TIG or MIG you have 2 choices.
For UTS of 125ksi or less, use E70-S2 filler.
For UTS > 125ksi use 17-22AS filler.
Source is MDD/Boeing data from my time at Air Canada.
Dick Hovey, P.Eng./ing.
AEROTECH RMH Inc,
Montreal, Quebec