Multiple choice

The welding technique used for joining material over 6 mm thick is

  1. hot gas welding

  2. freehand welding

  3. extrusion welding

  4. speed welding
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Extrusion welding allows the application of bigger welds in a single weld pass. It is the preferred technique for joining material over 6 mm thick. Welding rod is drawn into a miniature hand held plastic extruder, plasticized, and forced out of the extruder against the parts being joined, which are softened with a jet of hot air to allow bonding to take place.

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