Skip to main content

FW: [MW:4911] Welding of cast iron

By Materials & Welding


Hi Sasa,

 

Attached are  some guidelines on electrode selection and for welding of cast iron. Cast irons (SG and grey CIs) are weldable to a certain degree, white cast irons are not weldable. The conventional ways are to use Pure Nickel (99% ENi-CI) or Iron Nickel(55% Ni, E-NiFE-CI) electrodes. The later is more suited for welding on rusty, oiled and greased surfaces.

 

Cast iron could be inspected by conventional LPI and MPI  techniques. Often in LPI, the castings would have a tendency to bleed due to entrapment of excessive penetrant, hence proper cleaning of the penetrant are required.

 

ASME Sec VIII, DIV-1(Chapter UCI) is on cast iron pressure vessel. However welding is not greatly encouraged. Cast iron welding techniques are still more repair welding as of now.

 

Thanks.

 

Pradip Goswami,P.Eng

Senior Engineer/Specialist(Welding-Metallurgy)

Email-pradip.goswami@opg.com.

 

 

From: pgoswami@sympatico.ca [mailto:pgoswami@sympatico.ca]
Sent: Monday, April 19, 2010 10:42 AM
To: GOSWAMI Pradip -THERMAL
Subject: FW: [MW:4880] Welding of cast iron

 


 

Date: Mon, 19 Apr 2010 07:39:28 -0700
From: mkh_200@yahoo.com
Subject: [MW:4880] Welding of cast iron
To: materials-welding@googlegroups.com

What are the precautions before welding the ductile cast iron in pipe with Ø20?
Is there any NDT can applied after welding?
What is the applicable code for this welding??
 
SASA



--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.


THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc.

Comments

Post a Comment

Popular posts from this blog

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

By Materials & Welding
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...
Post a Comment
Read more

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction 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 oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more