How to stop Hydrogen cracking
How to stop Hydrogen cracking
Following factor that cause welding cracking:
# The Hydrogen amount. The greater hydrogen volume more cause welding cracking
# The steel hardness. more harder steel more prone
# The welding joint stress level. more rigid the more easy to crack. Notches are stress raisers and intensify the effect.
Following step How to stop Hydrogen cracking:
# Reducing welding stress. Make sure to allowing the welding joint to move and eliminate welding stress raisers such as notches. Use preheat process to reduces stresses by reducing the thermal shock. More higher steel strength make increases rigidity and stresses.
# Make sure to using soft steel material like S275,S235, s355 ,50, 43, 55 series are soft and highly unlikely to crack.
# Make sure to using austenitic steel electrode/consumables (Stainless E312,E309, E307,E308Mo). austenitic steel electrode compositions have the ability to absorb the hydrogen within the steels structure.
image source: www.mig-welding.co.uk
# Make sure to allowing Hydrogen to diffusing out steel material. Keeping it warm, again do preheat will increasing the diffusion time. Allow it to cool slowly after welding process, then packing in sand. also make sure to using low hydrogen electrode/consumables.
# make sure to using high parameters or high heat input processes.
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