What must tips used with liquefied gases have?

When using tips with liquefied gases for oxyfuel cutting, the design of the cutting tip is crucial for efficiency and safety. Tips that utilize liquefied gases, such as acetylene, feature preheat holes that facilitate the proper heating of the metal being cut before the actual cutting oxygen is introduced.

The inclusion of at least six preheat holes is important because it allows for an even distribution of heat around the cutting area. This ensures that the metal reaches the necessary temperature to create an efficient cutting process. Insufficient preheat can lead to difficulties in cutting, poor quality cuts, and even safety hazards as the gas may not ignite properly or the metal may not flow as intended during the cutting process.

The design typically incorporates these six preheat holes to optimize the heating effect and ensure a stable flame, leading to a more controlled operation. Additionally, this configuration helps in minimizing the risk of backfires and other potential hazards associated with oxyfuel cutting operations.