Workshop Technology
For welding plates of thickness less than 5 mm, its edges

Do not require bevelling
Should have a double-V or U-groove on both sides
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
The purpose of a riser is to

Deliver molten metal into the mould cavity
Deliver the molten metal from pouring basin to gate
Feed the molten metal to the casting in order to compensate for the shrinkage
Act as a reservoir for the molten metal

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