Identify the cause of contact, tip burn-back, and failure of the wire to feed.

Identification should include

• checking to make sure the welder is set for the correct settings for the material thickness
• inspecting and maintaining machine internals

• following equipment manufacturer guidelines and recommendations
• making necessary adjustments.

Process/Skill Questions:

• How is the proper thickness of metal determined?
• What type of shielding gas is recommended for the GMAW process?