Clad Steel Welding Process
Clad Steel Welding Process
(OP)
I have a vessel made of A516 gr 70 clad with 316L Stainless Steel. The vessel is to be constructed in accordance with ASME section VIII and my question is related to the welding process of clad material. I do not have very much experience with this type of material. I need to find out if the carbon steel side or the stainless steel (clad) side should be welded first? Also, if any problems may be caused by the wrong side being welded first? Are there any documents from AWS, ASME, or other organizations that discuss which side of the plate should be welded first?





RE: Clad Steel Welding Process
RE: Clad Steel Welding Process
Listed below is a recommended common technique for welding a cladded vessel:
1. Trim back the clad approximately 1/2" from the edge of weld joint.
2. Verify cladding is completely removed from the carbon steel so that the carbon steel weld doesn't get contaminated with Chromium, Nickel or Molybdenum. Note if the vessel wall is gouged into, weld build up the carbon steel wall thickness to meet code calculation requirements using an ASME section IX qualified WPS (weld procedure specification).
3. Weld the carbon steel portion of the weld joint with a WPS qualified to ASME section IX.
4. Grind the I.D. portion of carbon steel weld flush with the vessel wall.
5. Using an ASME section IX qualifed corrosion resistant weld overlay procedure weld the ovelay onto the stripped back area. Deposit the first layer using 309L or 309LMo filler metal. Deposit the second and possibly third weld layer using 316L.
RE: Clad Steel Welding Process
RE: Clad Steel Welding Process
RE: Clad Steel Welding Process
RE: Clad Steel Welding Process
"(b) When a shell, head, or other pressure part is welded to form a corner joint, as in Fig. UW-13.2, the weld shall be made between the base materials either by removing the clad material prior to welding the joint or by using weld procedures that will assure the base materials are fused. The corrosion resistance of the joint may be provided by using corrosion resistant and compatible weld filler material or may be restored by any other appropriate means."
This appears to cover corner joints, does this cover butt joints as well?
RE: Clad Steel Welding Process
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
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End of all knowledge is the attainment of immortality!
RE: Clad Steel Welding Process
Essentially ASME VIII, Div. 1 weld designs mandate weld strength equal to or greater than that of the base metal used in the design and will meet minimum ductility requirements of ASME IX as demonstrated in the welding procedure qualification. Depending on the service environment and weld accessibility there are a number of approaches to making these joints - most common are either similar to that proposed by weldmete or GRoberts.
RE: Clad Steel Welding Process
welding clad material is a standard practice now. you can weld from any side. if it is a single side weld welding first the CLADSIDE IS INEVITABLE. When so is the case seal the gap with TIG with the clad quality weld metal build it up by this or any other method till the 3mm layer is filled,put in a layer of richer alloy or nickel metal layer and weld the carbon side with the required electrode and method you have choosen.
when both the surfaces are accessable, follow the method suggested by some one earlier, cut back on the clad layer on either side of the weld, and if it is a double 'v' joint fill the 'v' till the clad surface, grind it clean deposite a rich layer of CRL and complete the weld of clad material.
turn to the other side and complete the weld after back gouging the root and grinding.
the richer layer I am talking is the one which has higher percentage of major alloying elements than the clad layer. for ex. if the clad layer is ss304, use either ss 309 or 310 as intermediate layer. if the clad layer is ssxxx-L alloy the carbon migration has to be contended with, hence a nickel layer is desirable as intermediate layer.
welding without the intermediate layer between carbon steel side and the CRA lyer will render the mixed material poor in all properties including the corrosion resistance.
hope the matter is clear.
regards,
MRCN
RE: Clad Steel Welding Process
James Kelly
www.rolledalloys.com
RE: Clad Steel Welding Process
1. Remove cladding during joint preparation, then weld the backing steel (base metal) with the appropriate carbon or low-alloy steel consumable, and finally, the region where the clad was removed during joint preparation will be overlaid with the appropriate high alloy consumable
2. Weld the entire thickness of the clad plate with the appropriate full alloy consumable
Published Information Sources:
International Steel Group (formerly Bethlehem Steel) - page 7 (9 in pdf)
http://www.bethsteel.com/customers/pdfs/clad.pdf
Nickel Development Institute (NiDI), the American Iron and Steel Institute (AISI), the American Society of Metals International (ASM Int’l), and the Committee of Stainless Steel Producers - page 33…36
http://www.nidi.org/multimedia/technical_support/technical_literature_pdfs/9000_aisi_publications/9002.PDF
Special Metals (formerly Inco Internetational) - page 23
http://www.specialmetals.com/publication/tech_bulletin_welding.pdf