Workshop Technology
The welding process used in joining mild steel shanks to high speed drills, is

Flash butt welding
Spot welding
Seam welding
Upset butt welding

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Workshop Technology
In a hot chamber die casting machine

Ferrous alloys with high melting temperature are casted
Ferrous alloys with low melting temperature are casted
Nonferrous alloys with high melting temperature are casted
Nonferrous alloys with low melting temperature are casted

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Workshop Technology
The diaphragm moulding machine is used to

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

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