Soldagem a arco manual versus soldagem protegida com gás CO2: as diferenças explicadas

Manual arc welding versus CO2 gas protected welding: the differences explained

The statement that the weld produced by gas shielded welding is not as solid as that of arc welding is not universally true. There are two types of welding wires used in gas shielded welding: solid and flux-cored.

The common welding technique for solid welding wire is pressure welding, which results in shallower weld penetration compared to cable welding.

On the other hand, the general welding method for flux cored welding wire is pull welding, similar to cable welding. The quality of welds produced using this method is comparable to cable welding.

In fact, many large equipment and tools, such as shipyards, are now welded primarily with gas-shielded flux-cored wire.

M annual arc welding against CO 2 gas shielded welding

CO 2 gas shielded welding:

Advantages of carbon dioxide gas welding:

  • Carbon dioxide gas provides good weld formation, has a fast welding speed and eliminates the need to change welding rods, saving time and increasing efficiency.
  • Carbon dioxide gas is a cost-effective and economical option.
  • The automatic control of the mechanical method is used to feed the welding wire and control the movement of the welding gun, which contributes to improving welding quality and productivity.
  • This method is suitable for workshop production and is convenient for use in areas where on-site conditions are difficult, such as with low wind resistance and the need for CO2 gas shielding.

Disadvantages of carbon dioxide gas welding:

  • CO 2 gas shielded welding has a tendency to produce a large amount of spatter. During the welding process, the decomposition of CO2 gas generates carbon, leading to an increase in the carbon content in the weld and increasing the likelihood of defects such as porosity.
  • CO 2 gas shielded welding requires special attention to safety due to high current density, high arc temperature and stronger arc radiation compared to manual arc welding. This can cause eye damage and skin burns.
  • This welding method also produces smoke, metal dust and harmful gases such as CO and NO. 3 .
  • The workpiece has strict requirements for mounting groove and clearance, and the selection of welding specifications is also strict.

Manual welding:

Advantages of manual arc welding:

  • The manual welding process is protected by a coating that contains decarburizing elements, which reduces the amount of carbon in the weld.
  • Arc welding is easy to handle as it contains slag.
  • It is convenient, flexible and the most economical choice for welding of various types and small batches.
  • Manual arc welding cannot be substituted for other welding methods for many installation and repair welding applications.

Disadvantage of manual arc welding:

  • The quality of manual arc welding largely depends on the skill level of the welder, requiring rigorous training of welders before they can engage in this type of welding work.

Summary:

After investigation, it was discovered that there is no clear division of labor between manual arc welding and CO. 2 gas shielded welding in the workshop, as both welding machines can meet production requirements. However, manual arc welding has the advantage of being easily portable and having good mobility and flexibility.

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