Re: [MW:33339] Hardness Issue on weld metal

Dear Sir,

Thanks for your email.

Consider my reply marked in "Blue"

On Tue, Jul 19, 2022 at 7:22 AM srinivas rao <engr.srini@gmail.com> wrote:

below points to be verfied to analysie the hardeness issue 

1. Travel speed followed 

     

Root	GTAW	ER80S-D2	2.4	200° C	200 - 285 ° C	102	10	101.45	0.603
Hot Pass	GTAW	ER80S-D2	2.4	-	200 - 285 ° C	175	11.4	130.20	0.919
Fill	SMAW	E10018-D2	2.5 & 3.2	-	200 - 285 ° C	111.1	22.8	84.10	1.807
Cap	SMAW	E10018-D2	2.5 & 3.2	-	200 - 285 ° C	84	22.70	106.20	1.077

 

Root & Hot Pass - GTAW

Fill Pass No.1 - 2.5 mm Dia - SMAW

Fill Pass No.2,3,4 - 3.2 mm Dia - SMAW

Cap 1,2,3 - 2.5 mm Dia. - SMAW

 

2. How weld pass is deposited at different positions (what is the location of  specimen 6 O clock or 12 clock or 3clock )

      1G Position  

3. Check tempering effect of last pass over the previous pass (bead overlaping may not made properly ) - to get proper tempering effect minimum bead overlap to followed.

the reason for increse of Hardness & strength after a heat treatment could be due to Secondary Hardening effect.

Thanks & regards,

Srinivas Rao

welding Engineer 

On Monday, July 18, 2022 at 2:13:09 PM UTC+4 williamswilsonp wrote:

Dear Experts, 

Regarding my query about the high hardness, the higher value is coming near the portion of final fill (1.5 mm down from the top weld line).

What will be the reason behind this?

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