Workshop Technology
In shielded arc welding

None of the listed here
Welding rod coated with fluxing material is used
Welding rod coated with slag is used
Large electrode is used

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Workshop Technology
The purpose of a riser is to

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
Deliver molten metal into the mould cavity

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