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

By Materials & Welding
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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