Why Must Metal That Is Below 70°F (20°C) Be Preheated

question 39

Multiple Choice

Why must metal that is below 70°F (20°C) be preheated before welding?

• A) If the metal is too cold, you cannot get a weld pool established.
• B) Because the cold metal quenches the weld.
• C) The arc on cold metal is not stable, and it will wander around the surface making it hard to keep the weld going along the joint.
• D) The hot metal on the cold plate will not stick, it just bounces off.

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