Here is an extract from lincon catalogue, they recommend L50 wire to avoid this or change the flux to 860
865… is a general purpose flux designed to weld butt joints and flat and horizontal fillets. 865 produces 70,000 psi tensile strength as welded or after short or long term stress relief. 865 flux should be used with L-50 electrode for optimum impact properties, resistance to rust porosity, and resistance to pock marking. L-61 may be used on steel free of scale and rust.
-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of limesh M
Sent: Thursday, June 10, 2010 2:39 PM
To: Materials & Welding
Subject: [MW:5514] Re: POAK MRKS ON SAW WELDING
Dear Mr. Masthan,
Which company product you are using?We faced such kind of problem with ESAB filler and flux combination and eliminated the problem by introducing Lincoln products.The problem we faced only on surface profile of the weld bead(Radiography was OK).There was no metallurgical problem with ESAB products during SAW process.
On Jun 9, 11:18 pm, "masthan" <sabreenbah...@hotmail.com> wrote:
> Hi
>
> We are continuously facing problem of Poak marks on the SAW Welding surface.
> Welding Consumable L-61 (wire) with 865 (flux) combinations. Any body
> has idea to prevent this. Please share.
>
> Best Regards
>
> M.Masthan
>
> K.S.A
.
Hi, You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this. Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime. Again, these simulated no. Of cycles shall be specified in MTC. The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case). One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example. In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
Comments