Consumeables Catalog - Lincoln Electric

APPENDIX
Hardfacing
Cross Checking
Special precautions should be taken with any build-up or hardfacing product on applications that are inherently
crack sensitive, such as high carbon or alloy steels, previously hardfaced parts, highly stressed parts, and work
hardened parts. The hardfacing of heavy cylinders, massive parts and parts having complex shapes are all
examples of applications exhibiting high internal stresses that may result in delayed cracking.
These applications may require one or more of the following:
• Higher preheat temperatures
• Higher interpass temperatures
• Controlled slow cooling between passes and/or layers
• Stress relieving
• Minimizing layer thickness
The table below will help determine if special precautions need to be taken with specific Lincore ® wires:
SPECIAL PRECAUTIONS
Product
Higher Preheat Temp. (1)
150°C - 260ºC (300°F - 500ºF)
200°C - 260ºC (400°F - 500ºF)
Lincore ® Products
55 55-G 65-O 60-O 30-S 32-S 35-S 40-S 42-S
Higher Interpass Temp.
200°C - 320ºC (400°F-600ºF)
Controlled Cooling Between Passes/Layers
Stress Relieving 430°C - 480ºC (800°F - 900ºF) (2)
Every 6.4 mm (1/4 in) Thickness of Deposit
Every 10-13 mm (3/8 - 1/2 in) Thickness of Deposit
Minimize Layer Thickness
(1) Preheat depends on the base material chemistry and thickness, as well as the weld metal chemistry.
(2) Stress relieving in temperatures in excess of 482°C (900°F) will result in a “softening” of the deposit.
WELDING CONSUMABLES CATALOG ı 385