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

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

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Workshop Technology
For arc welding

Direct current is used
Alternating current with low frequency is used
Alternating current with high frequency is used
Any one of these

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