Re: [MW:17947] PQR for Welding Weldox 700

Did yoy secure the fit-up tight enough.
If you give the testplate room for free deformation, you'll get "strain aging", precipitation at dislocation areas, very bad for impact values.
Use 4 - 5 stiffeners on the back side of the test weld on 40 cm weldlength, first (allmost) completely weld on the front side, then place stiffeners on the front side, remove stiffeners on the back side, clean the backside of the root, and finalize the back weld
After complete cool-down, remove the stiffeners

p.s. Use stiffeners of 35 mm thick, at least 300 mm long, 80 mm high, connect them with fillet welds, z=15 mm to the test plates
Regards

Jurgen Prinsen, MSc, IWE

(experience is learning from mistakes, if you have a lot of experience, you have made a lot of mistakes)
You have cheap experience, you have expensive experience, the expensie one is, when you learn from your own mistakes, the cheap one is when you learn from somebody elses mistakes
If you make no mistakes you often make nothing at all


----- Oorspronkelijk bericht -----
Van: "Rudolf" <rudolf_jude@yahoo.com>
Aan: materials-welding@googlegroups.com
Cc: materials-welding@googlegroups.com
Verzonden: Maandag 17 juni 2013 10:42:27
Onderwerp: Re: [MW:17945] PQR for Welding Weldox 700

Average of 165 joules

Sent from my iPhone

On 17 Jun, 2013, at 4:37 PM, J Prinsen <weldtech@online.nl> wrote:

> What were the original impact values of the base metal
>
> Jurgen Prinsen IWE
>
> ----- Oorspronkelijk bericht -----
> Van: "kannayeram gnanapandithan" <kgpandithan@gmail.com>
> Aan: "materials-welding" <materials-welding@googlegroups.com>
> Verzonden: Zondag 16 juni 2013 08:42:04
> Onderwerp: Re: [MW:17941] PQR for Welding Weldox 700
>
>
> This attachment may be usefull
>
>
>
> On Sat, Jun 15, 2013 at 7:02 PM, rudolf < rudolf.jude@gmail.com > wrote:
>
>
> Dear Community Members.
>
>
> We have done a PQR coupon for welding Weldox 700E. The material Thickness was 35 mm. Double V Groove Butt Joint. 2G position. Code AWS D1.1
>
>
> The following parameters were followed
>
>
> Process = FCAW
> Electrode wire = Esab Dual Shield II 110
> Gas = 80 % Argon 20% Co2
> Gas Flow = 20 lpm
>
>
> Preheat to 103 C
> Interpass temp around 150 C
>
>
> Current Settings
>
>
> DCEP CV
> Amps 200 amps 24 Volts for root pass
> Amps 180 to 160 24 Volts for hot, fill and capping.
>
>
> The heat input recorded was between .8 to 1.5 kj/mm
> The wire feed rate was 10 m/min
>
>
> We did a charpy test on weld metal however it failed.
> The results were average of 8 kj absorption at -40 C
>
>
> At 1mm and 5mm from fusion line the absorption was 80 to 130kj
>
>
> Intend to do a re charpy test @ -18 C.
>
>
> Though the client has not specified Charpy requirements and specifications. Wanted to do it for future requirements if any.
>
>
> Request you to please share your opinion,
>
>
> WHAT COULD BE THE REASON THE CHARPY @ WELD METAL IS SO LOW, and in the absence of specific requirements for CVN what should be the impact values.
>
>
> AWS D1.1 does not state any values for Yield strength above 355 MPA, but leaves the onus on the client to specifiy.
>
>
> Please advise.
>
>
> Thanks
> Rudolf
>
>
>
>
>
>
>
>
>
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