CUTTING TORCH FOR CUTTING ULTRAHIGH-THICKNESS 2000-3500 MM LOW-CARBON AND LOW-ALLOY STEEL INGOT AND CUTTING PROCESS OF THE CUTTING TORCH

摘要

The present invention provides a cutting torch for cutting an ultrahigh-thickness 2000-3500 mm low-carbon and low-alloy steel ingot and a cutting process of the cutting torch, belonging to the technical field of oxygen cutting metal. The cutting torch is characterized in that preheating oxygen and propane gas are not mixed inside the cutting tip of the cutting torch at first, a preheating oxygen duct and a gas duct both are inclined toward the axis of the cutting torch, a large-flow cutting oxygen cutting tip is adopted and the diameter of the throat part of the cutting tip is 17-22 mm, and each gas duct is designed into a structure with the lower part thereof slightly spread, the diameter of the inlet thereof is 4.5 mm, the spreading taper angle is 1.146° and the length of the spreading section is 8 mm. The cutting torch provided by the present invention and the cutting process are suitable for good-quality and high-efficiency cutting of the ultrahigh-thickness 2000-3500 mm low-carbon and low-alloy steel ingot.