4130 help

By TRC

Date 01-27-2005 17:57

Can anyone suggest a filler wire for 4130. It will be pwht. Welds will be single bevel groove, double bevel grove (not complete penetration) and fillet. Weld sizes are only 3/16 grove and fillet.
I was planning on GTAW for the single bevel groove and GMAW or FCAW for the fillets.
Code is D1.1, will I have to do a PQR or is it prequalified? Can I do a combo test using GTAW for the root and some fill passes before filling and capping with GMAW/FCAW?

Thanks in advance- Ted

By TRC

Date 01-28-2005 22:39

By Mikeomni1 (*)

Date 01-28-2005 22:58

AISI 4130 is a material controlled and specified only by its chemical analysis. The physical properties are developed by heat treating.
Generally the heat treatment is a water quench and temper to a particular hardness and tensile range. To answer your question, we would need to know the minimum required physical properties of the material to be welded and the PWHT details.

Regards,

Mike

By TRC

Date 01-29-2005 00:42

Thank you Mike, I'll get more details tomorrow or Monday. Ted

By jwm80 Date 01-29-2005 22:04

ER80S D-2 is a high carbon content wire that would more than suitable for GTAW. 3/32 dia. wire would be be my choice.

By TRC

Date 01-30-2005 02:16

10-4 on the 80S for the GTAW. Any thoughts on the FCAW or metal core/solid? Found out that the weldment will be stress relieved only and not "heated treated RC30/40", does that make sense?
Ted

By Mikeomni1 (*)

Date 01-31-2005 21:39

Rockwell "C" hardness in the range of 30 RC to 40 RC approximates a tensile strength range of 136 ksi to 182 ksi. Most any electrode or filler metal you use will be under matched for the 4130 base metal in this hardness/tensile strength range. The high hardness indicates the material has already been quenched and tempered. 4130 in this part of the world is generally welded with a realitively high preheat and interpass temperature and insulated to slow cool or placed immediatly in PWHT to prevent cracking of the HAZ.

Regards,
Mike