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(a) Will require a permanent or temporary backing to be pre placed on the Root side of the welds.
(b) Has the advantage of being able to use any type or size of electrode.
(c) Is likely to be using an electrode less than 2 mm dia.
(d) Is likely to be using an electrode more than 2 mm dia.
(b) Misalignment problems.
(d) All of the above.