Autogenous purity criterion
The purity criterion for oxy-acetylene welding specifies how clean the weld must be to remove oxides and avoid grooves. Contaminants lead to incomplete combustion and poor results.
Physikalisch-chemischer Wirkmechanismus
The purity criterion for oxy-acetylene cutting refers to the minimum requirement for oxygen purity during cutting. With sufficient oxygen, oxides can be burned quickly and completely, ensuring a clean weld. Contaminants in the gas lead to incomplete combustion of oxides, which can cause grooves and other quality problems.
Metallurgical Relevance & Welding Risks
Too low an oxygen purity or contaminants in the gas can prevent oxides from burning completely. This can lead to incomplete combustion and grooving in the weld. Weld quality is affected, which poses risks to mechanical strength and component life.
Werkstattpraxis & Handlungsanweisungen
To meet the purity criterion for oxy-acetylene cutting, the oxygen purity in the gas must be at least 95%. Contaminants such as carbon or hydrogen must be excluded. This can be ensured by proper selection and maintenance of the welding gas and equipment. If necessary, gas analyzers should be used to monitor oxygen purity and contaminants in the gas.