Flame cutting of metal is a relatively inexpensive, economical technology. The work must be done by a qualified operator. The method is used in mechanical engineering, nonferrous and ferrous metallurgy and other industries.
It is necessary
- - A cylinder with oxygen and propane;
- - overalls;
- - mouthpiece;
- - metal.
Instructions
Step 1
First, warm up the cutting area to a certain temperature. Keep in mind that there may be a different heat value for each type of metal. Basically, it varies from 300 to 1300 degrees. The preliminary procedure will allow the oxidation of the metal in oxygen to begin. As a result, a flame of acetylene or substitute gases appears. After that, you can let in oxygen, which cuts the metal and immediately removes the oxides. Make sure that the heating flame is continuous, for this it must be in front of the oxygen stream.
Step 2
Whenever possible, select low carbon steels with a substance content of no more than 0.3%. They are most easily cut to the cutting process. For high carbon metals, you will need to resort to cutting with the addition of special fluxes.
Step 3
Pay attention to the flame, its length should directly depend on the thickness of the metal. Thus, a substance with a thickness exceeding 400 mm must be cut with a flame that penetrates to the full depth, containing a large amount of acetylene. Otherwise, a normal flame can be dispensed with.
Step 4
Select the desired cutting speed based on the thickness of the metal. The larger it is, the stronger the speed should be.
Step 5
Set the direction of the flame to the very edge of the metal, it is very important to choose the correct angle of inclination from the very beginning. Aim the heating flame at the edge of the metal until you reach the desired reflow temperature.
Step 6
Follow a specific metal cutting procedure if you want to saddle holes. In this case, first heat the edge of the material, then turn off the flame and only then start the cutting oxygen supply. Open the valve on the torch very slowly, so the oxygen flame will ignite from the molten metal on its own, and you will avoid the backfire of the flame, cotton.
Step 7
Pay attention to the thickness of the metal: if it exceeds 50 mm, keep the sheets at an angle, so you can ensure the drainage of slag formations and do the job as accurately as possible.
Step 8
Choose a mouthpiece based on the thickness of the metal: if it varies between 8-300 mm, you will need a mouthpiece with an outer number from 1 to 5 and an inner number from 1 to 2.
Step 9
You will be able to correctly carry out the process of cutting metal, initially choosing the correct angle of inclination of the torch during cutting, determining the point from which you will start cutting, maintaining the correct angle of the flame (no more than 5 degrees of inclination, with a metal thickness of more than 100 mm, a deviation of 2-3 degrees is allowed) by selecting the correct gas and the correct mouthpiece number.
