NBIC - alternative Welding Method

[MISTER MONK]

HI All. I am new here. Hope someone can help. In the NBIC, welding method #6 there is a term "controlled fill technique". There is no such welding technique defined anywhere. Does anyone know about this? Where did the term come from? This is not in AWS so it must be a NBIC technique. Did the NBIC just make up the term? Any help would be appreciated.

 

[pradipgoswami]

As I understand this technique is the product of joint efforts of National Board and EPRI for welding repair of Grade-91 Steel, especially for Grade 91 tube material when it’s impractical to perform local PWHT.
NBIC specifies the limitations for this technique. According to NBIC-2015,this repair is limited to use of an austenitic, nickel-base filler metal ,F-No. 43 and limited to the following consumables: ERNiCr-3 (Filler Metal 82), ENiCrFe-3 (INCONEL Welding Electrode 182), ENiCrFe-2 (INCO-WELD A), ASME B&PV Code Cases 2733and 2734 (EPRI P87 Filler).
You may find some idea about his technique in his article:

http://m.energy-tech.com/mobile/steam/article_568f15ba-525c-11e5-8d42-43939fcdce0b.html.

My understanding is this technique is still under development.
Thanks.

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

 

[metengr]

Controlled fill technique is fully described in the new Welding Supplement 11 about to be published in the 2017 Edition of the NBIC next month. I have been involved with EPRI on the development of this technique. It really has to deal with bead placement unlike temper bead where bead overlap and heat input are essential variables.

EPRI has performed a significant amount of testing and development regarding an "engineered approach" for repair of Grade 91 steels. There are some free publications on this subject.