CARBON EQUIVALENT
What is Carbon Equivalent?
It is a numerical value of assessment in terms of carbon equivalent(CE) content for measurement of the weldability of material such as carbon steels & alloyed steels.
Maksudnyer, kita boleh tahu kandungan karbon dalam sesuatu material punyer chemical composition.
CE = %C + %Mn/4 +%Ni/20 + %Cr/10 + %Mo/5 + %Cu/40 + %V/10
Why we want to know CE ?
Sebabnyer walaupun semua jenis carbon adalah sangat stabil and require high temperature to react even with oxygen, tetapi, bila kita buat welding, joint tu mudah crack. Mengikut kajian yg dibuat oleh pakar-pakar welding (my lecturer)
CE<0.5 = Steels are Weldable
CE>0.5 = Crack Sensitive
CE<0.4 = Relatively Less Sensitive to Cracks
HIGH CE = Require preheating, use low hydrogen welding procedure
Sebab itu la kite kene pastikan CE sesuatu bahan yg kite nak welding itu. Daripada data ini, kita boleh tahu method welding mana yg sesuai digunakan untuk mewelding material tersebut.
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