Gas welding of metals

Gas welding of metals - Welding is the process of melting metals using oxygen and a combustible gas to fuse them at the atomic level. Acetylene is primarily used, while propane, hydrogen, gasoline, and butane are less commonly used. The heat generated during combustion melts the surface edges and the filler material, forming a weld pool. Depending on the amount of oxygen supplied, the flame can be oxidizing, normal, or reducing. The filler rod is selected based on the composition of the metal being welded, and the diameter is determined by the thickness of the metal.

Gas welding of metals by smoothly and slowly heating the metal it reaches a molten state, which takes into account:

• steel thickness (0.2 - 5 mm), with increasing thickness its performance decreases;
• non-ferrous metal;
• tool metals that require gradual heating and slow cooling;
• special steels and cast iron that require preheating during welding.

GOST for gas welding of metals

Welding of metals is a process that requires special attention to safety precautions and careful implementation of these requirements. GOST for gas welding of metals imposes numerous requirements for performing welding work without injury. The terms established by the standard are mandatory for use in all types of documentation. One standard term is established for each individual concept, and the use of a synonymous term is prohibited; this constitutes a violation. In reference books, prohibited terms are designated as "NDP."

Here are some standards for gas equipment and metal cutting:

• GOST 4.41-85. System of product quality indicators. Thermal cutting machines for metals. This GOST establishes the basic quality requirements for stationary thermal cutting machines for metals;
• GOST 1077-79 draws attention to the standard of single-flame torches intended for manual acetylene-oxygen welding, soldering, heating and other types of metal welding;
• GOST 9356-75 sets out requirements for welding hoses with a thread frame, which are used to supply acetylene, butane, propane, oxygen and other gases to devices for gas welding and cutting metals;
• GOST 949-73 applies to cylinders made of alloy and carbon steel of small volume (12 liters) and medium (from 20 to 50 liters), the working pressure of which is up to 19.6 MPa and made of seamless pipes, intended for storing compressed gases, liquefied and dissolved gases that can withstand temperatures from minus 50⁰ From to +60⁰ WITH.

GOST for gas welding of metals provides a reliable guarantee of safety when performing welding work, provided that all these requirements are met.

Gas welding technology for metals

Gas welding technology for metals includes the following:

• Good preparation of the part for welding;
• Weld edges must be thoroughly cleaned of oil stains, dirt, scale, and rust. The width of the cleaned area is 20-30 mm on each side. Clean until the metal shines. This can be done with a brush, acid-based paste, or acid. Prepare the edges of the weld joint;
• The welding mode is selected;
• To do this, consider the grade of metal being welded and the intended purpose of the product. The power of the welding torch, flame type, filler rod diameter, and welding technique are all taken into account;
• Gas welding technique;

The position of the burner, its direction. From the correct gas welding technologies for metals A lot depends on quality and productivity. The angle of inclination depends on the angle of the nozzle; for thicker metal, the angle increases. This effectively concentrates the heating of the metal in one spot. The nozzle moves both transversely and longitudinally. The primary movement is the longitudinal one. The transverse movement is auxiliary and is necessary for uniform heating of the edge.

Advantages of gas welding:

• a simple type of welding, and also not expensive;
• the ability to purchase gas everywhere;
• there is no need for a powerful energy source.