Hard facind Welding overlay

By VLADIMIR SILVA Date 10-17-2018 18:44 Edited 10-17-2018 19:37

Hello all !

I have problems welding The base metal X22CrMoV12-1 (Number: 1.4923) with Consumable (ERCoCr -A) - (SFA 5.21),

using the process GTAW, It`s a Internal circunferecial welding and the dimensional of specimen is : Øexternal: 145 x Ø105internal.

I got cracks on third layer, and some times on second layer.

How can I avoid this cracks ?

Follow the parameters used on weld:

current: 120 to 130 A
Voltage: 12 to 15V
Travel speed: 70 to 105 mm/min.

By PhilThomas (**)

Date 10-22-2018 00:15

Are you using any preheat and/or slow cooling upon completion? What kind of cracks are you getting?

By VLADIMIR SILVA Date 10-22-2018 17:07

Hi Phil,

thanks to reply.

We are preheating the specimen with 250ºC and using interpass <350ºC

We are Qualifying a Process from ISO 15614-7 : 2016 and The Process

used is GTAW.

The cracks are in longitudinal way and transversal to the weld,

It´s a circunferencial weld and have 150mm length. I think it`s a shrinkage crack.

Sincerely.

By PhilThomas (**)

Date 11-03-2018 03:51

Vladimir - often a circumferential weld creates very high stress if welded all the way around in one pass. Have you tried welding half of the circumference, and then welding the other half in the opposite direction? Also - crater filling with cobalt is crucial to avoiding shrinkage cracks.

By VLADIMIR SILVA Date 11-08-2018 09:26

Thanks about the explanation Phil,

I`ll try to do it .

Sincerely

Vladimir