Answer :
Final answer:
The difference lies in the number of weld passes and sides of the joint welded; a single weld involves one weld pass from one side while a double weld involves weld passes on both sides or multiple passes on one side for a stronger joint.
Explanation:
Difference Between Single Weld and Double Weld
The difference between a single weld and a double weld pertains to the application of weld passes and how they are applied to a joint in welding, a process used for joining metal materials with solder and heat. Option (a) and (b) describe a single weld, which is indeed applied from one side of the joint with one weld pass. A double weld, as indicated in option (c), is made with two weld passes which typically means that both sides of the joint are worked upon. Option (d) is incorrect as a double weld involves welding from both sides or in some cases, multiple passes on the same side, to achieve a stronger and more secure joint, not just one side.
