Recent content by Metaljon

Just completed the mechanical tests and OK for tensile but fails the face bend test to ASME IX. The root bend was good, the two face bend tests failed. I did not specify in the procedure about excess reinforcement and grinding off the cap and this may have affected the result for the face...

Thanks for the input on this repair. The repair is a turbine runner for a hydro station with blades and PWHT is not an option. I did consider 309 option as there is a large crack in the casing and 309 would give good ductility but decided to go with the 410. I restricted pre-heating to 120 C...

I am prepared a PQR test report for qualification of a temper-bead butt repair on CA-6NM martensitic material to ASME IX. As part of the testing we are performing tensile, bend tests, macro and hardness. The WPS specifies a temper-bead repair using a minimum preheat 120 C. The weld metal is...

Thanks for the input. I will try and get a set of ASTM vintage standards on ebay.

I am working on hydro station refurbishment and I have a number of materials that are referred to on the drawing related to the period of construction of 1936 to 1950. The materials are referenced as follows: Steel Forging ASTM A236-42C (Cross reference BS 24 Part 4 Spec 9C -1941) Corrosion...

Not easy as the chemical composition can overlap. The Manganese on the X42 has a slightly higher upper level of 1.3wt% compared to ASTM A106B which has a maximum of 1.06wt%. Try using a PMI chemical analyser.

I don't think this is an issue with duplex forgings. Maybe P91 steel would be important but not duplex stainless.

I think the dimensions give the width of the angles in three dimensions. The 9*3/8" means the angles is 9"x 9" with a thickness of 3/8". The 7 7/16" means the angle section is 7 7/16" x 7 7/16" with a thickness of 3/8"

Yes Canadian that explains everything.

x 3 repair cycles is commonly specified for the low alloy steels and 9Cr grades. But I don't think in your case there is a formal limitation. It is good practice to try and remove as much of the old weld metal and HAZ if repaired multiple times. It depends on the reason for defects forming...

We use the TWI (UK) Weldspec system for WPS and PQR. It is very professional and easy to use software. Costs a little more than free template but then the job is done properly.

Have a read of this article. http://www.asfabrications.co.uk/technical/steel-information/tempering-colour-chart/ The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the...

I would recommend the HVOF process for performing such a repair. It produces well bonded, high-density coatings with high hardness, delivering outstanding performance in aggressive wear and corrosive environments.

Yes exactly. Why leave this to chance when all you need is some preheating to be applied and then there is no problem at all.

It is good practice to apply preheat before thermal cutting. You are definitely at risk of forming martensite for P22 if thermal cutting is applied. It will be impossible to establish whether the HAZ region has been all removed by grinding.