Workshop Technology
For welding plates of thickness more than 12.5 mm, its edges

Should have a double-V or U-groove on both sides
Do not require bevelling
Should be bevelled to a single-V or U-groove
Should have a double-V or U-groove on one side

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Workshop Technology
A jolt machine is used to

Produce uniform sand hardness throughout the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform packing of sand in the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

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