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What is cladding overlay?
Cladding overlay is a welding process that metal with high performance of anti corrosion, wear resistance property is cladded on the base metal. A classic example is to clad stainless steel or Nickel based alloy on the carbon steel which shall be anti corrosion while cost reduces significantly comparing to pure stainless steel or Nickel based alloy.
Key factors of cladding quality
A- Dilution
 
  Dilution  
Manual Metal Arc /SMAW/MMA 25 - 30% Manual
Metal Inert Gas /MIG/GMAW 10 - 50% Automatic  
Tungsten Inert Gas /TIG >20% Manual  
Submerged Arc Weld Wire /SAW 20 - 25%   Automatic
Submerged Arc Weld Strip /SAW 10 - 15% Automatic
 
 
 Wilhelm:
 
TIG / GTAW / HWGTAW < 5% Automatic
B- Comparison of chemical composition
Inconel Alloy 625 Standard Requirement
 
 
Element  Content (%)
Ni 58 min
Cr 20 – 23
Mo 8 – 10
Nb+Ta  3.15 - 4.15
Fe  5 max
 
 
Composition Analysis Report of Wilhelm WPS specimen
 
 
 
Hardness control of HAZ
Reasonable and effective control of hardness on HAZ can be achieved by experienced welding process.

 
 
Hardness control of HAZ by Wilhelm 

 
A、Comparing to carbon steel, low alloy etc.                    
√  Longer service life
√  Free from medium leakage by corrosion
√  No need of corrosion allowance
B、Comparing to pure anti corrosion materials
√  more economic cost.
√  Shorter and more flexible lead time
√  Combine anti corrosion performance with high strength performance of carbon steel, low alloy.
 Current major cladding equipments include in Wilhelm Suzhou
·Hot wire TIG vertical cladding equipments
·Hot wire TIG horizontal cladding equipments
Base materials include but not limit to 
ASTM A106 Gr.B / ASTM A53
API 5L Gr. X52 to X70   
ASTM A333 Gr6   
ASTM A182 F11/F22
ASTM A350 LF2
ASTM A694 F52 to F70
AISI 4130/8630   
 
Cladding products include:    
Pipes & Tubes    
Pipe Spools    
Flanges    
Fittings: Elbows/ Tees、Reducers etc.
Bends: 3D - 8 D    
X'mas trees    
Valves components    
Pressure Vessel Nozzles
Special Forgings etc.
CRA materials include:        
Nickel Alloy: INCONEL 625, INCOLOY 825, INCONEL 725, INCONEL C-276, C22, MONEL400 etc. 
Stainless Steel: 3, 4 series;
904L,S31254；
Duplexes,      
Copper Nickel Alloy, others