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Gas metal arc welding (GMAW) wire arc additive manufacturing (WAAM) processes use inert shielding to protect the weld arc during material deposition, but do not protect the trailing bead, which can lead to weld issues varying from low finish quality to diminished material prop
The state of the art of installing spray foam is to install manually. The installers must wear safety gear to avoid exposure to the chemicals. Additionally, fatigue often results from handling the spray gun hours in a day which can lead to mistakes and low quality foam.