What is a common cause of tungsten frosting or discoloration?

What is a common cause of tungsten frosting or discoloration?

• A. Inadequate shielding gas
• B. Excessive current
• C. Improper torch angle
• D. Low welding speed

Answer: (A)

Shielding gas coverage protects the tungsten electrode and the weld pool from reacting with air. When the gas flow is inadequate, air can reach the tungsten tip, causing oxidation that shows up as a dull white or frosted coating and sometimes discoloration. This frosting is a clear sign that shielding gas isn’t doing its job, which can happen from too low a flow rate, leaks in the gas line, or drafts blowing gas away from the arc. Fixing it involves increasing the gas flow to a proper rate, checking hoses and connections for leaks, and shielding the weld area from drafts so the gas can protect the electrode and weld consistently.

Shielding gas coverage protects the tungsten electrode and the weld pool from reacting with air. When the gas flow is inadequate, air can reach the tungsten tip, causing oxidation that shows up as a dull white or frosted coating and sometimes discoloration. This frosting is a clear sign that shielding gas isn’t doing its job, which can happen from too low a flow rate, leaks in the gas line, or drafts blowing gas away from the arc. Fixing it involves increasing the gas flow to a proper rate, checking hoses and connections for leaks, and shielding the weld area from drafts so the gas can protect the electrode and weld consistently.