Shielding Gas Nozzle
The gas nozzle is a tubular part of the welding torch that directs the shielding gas stream onto the weld pool and protects the molten weld metal from oxidation.
Physical-Chemical Mechanism of Action
The shielding gas nozzle directs a laminar gas flow from the welding torch to the molten zone. This flow forms a dense layer that protects the molten weld metal from atmospheric oxygen and prevents porosity.
Metallurgical Relevance & Risks in Welding
Without an effective shielding gas nozzle, the molten weld metal can oxidize quickly, leading to porosity and poor fusion. This increases the risk of cracks and reduces weld strength.
Workshop Practice & Instructions
Make sure the shielding gas nozzle is correctly mounted and directs the gas flow unobstructed to the workpiece. Check the nozzle regularly for gaps or contamination, as these can impair shielding gas effectiveness.