Further to add to a detailed explantion given by Mr. Herman, Larger Grain size reduces Elongation, so Sterss Relieve to refine the grain size would be helful to achieve Enongation,
Porosity and H2 entrappment can greatly reduce Elongation value so Have a check for Porosity and Inclusions, which significantly reduces Strength and Elongation.
Please specify Design code, Material Thickness and MDMT in order to find out whether Impact is required? if it's mandatory as per Client spec and Let's say your Design code is ASME B31.3, then you can refer to Fig. 323.2.2A,
Hope this would be useful,
Regards
Manpreet Singh
On Tue, 18 Jan 2011 02:18:27 +0530 hpi001
>Dear Sir,
>
>As already mentioned in other topics both filler metals are cellulosic
>types in which E6010 is normally used for root layers only whereas
>E7010-P1 is used for fill layers and cap layers. What is important
>when testing welds executed with cellulosic filler metals is the time
>between welding and testing. This because of the H2 dissolved in weld
>metal needs time to diffuse from the weld metal, approximately 48
>hours, in order to avoid so called fish eyes during tensile testing
>and/or bend tests because this will lower materials mechanical
>properties especially elongation. For this reason you always have to
>execute a post weld heat treatment of 4 hours at 250 °C in order to
>ensure all H2 is diffused in front of mechanical testing. Did you
>execute this on your test welds?
>I assume you mean specimen size 10 x 5 x 55 mm for Charpy-V impact
>test, test temperature depends on your project requirements and should
>be similar to the temperature for standard 10 x 10 x 55 mm specimens.
>According to filler metal manufacturer (Böhler Welding) these filler
>metals have guaranteed impact values up to -40 °C.
>
>Best Regards,
>
>Herman Pieper
>
>On Jan 16, 8:52 am, eldhois...@rediffmail.com wrote:
>> Dear All,
>>
>> Presently we have conducted a Destructive test-(All Weld Tensile Test) for a E6010 and E7010 electrode,in which the Elongation Value is 20.2 %and 20%, whereas the required value as per the specification is 22%.Kindly please tell me if this can be acceptable or any consideration can be given to this test value ?
>> Also kindly please tell me for carrying out Charpy V Impact Test for 10mm X 5mm X15 mm ,Specimen for X65 Grade material Pipe welded with E6010 and E7010-P1 what is the temperature it has to be tested.?
>> Kindly give your suggestions at your earliest..
>> Regards,
>> Eldho Isaac,Inspection Engineer.
>
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