आर्क वेल्डिंग (arc welding) में, इष्टतम आर्क लंबाई लगभग किसके बराबर होती है?

The significance of achieving a good weld in electrical welding lies primarily in:

In gas welding, acetylene gas is typically used along with which auxiliary gas?

Identify the flame type that is not categorized according to the velocity of flame propagation:

What is the primary objective of post-heating a cast iron joint immediately after welding?

What is the primary purpose of using a thermochalk (tempil stick) in welding operations?