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DIFFERENCE BETWEEN GAS AND GASLESS WELDING MACHINE
The continuous wire welding machine operation differs from direct welding because the union of the two pieces of metal we are going to join is supported by the filler material, i.e., our wire.
During this process, it is very important to use the same or higher quality of material compared to the base material to avoid issues over time in the weld.
Using a wire welding machine is very simple and intuitive.
The machine contains a wire coil (filler material) that is gradually released during welding.
The wire flows through the welding torch pushed by the wire rollers, which also adjust its speed, bringing it to the part and closing the circuit with the ground clamp.
Advantages of wire welding with gas (mig/mag)
Welding with shielding gas certainly provides a better result in terms of appearance, thanks to the high degree of protection that the gas provides for the weld pool during fusion, as well as the more effective cooling process.
The gases used during this process vary depending on the material that you have to weld.
The three most commonly used are:
mix (80%argon/20%co2) for iron
mix (98% argon/2%co2) for stainless steel
argon for aluminum welding
If you want to approach this welding technique, you must always keep in mind that it is very important to adjust the continuous wire welding machine in relation to the thickness of the wire you are using, the meters/minute set on your wire roller, the amperage you are working at, and how many liters/minute of gas are being released.
Fortunately, in the last few years, the major welding machine manufacturers have developed a new generation of synergic welding machines that help even the least expert operator to correctly set the parameters of amperage and wire speed (meters/minute). As far as the flow of shielding gas is concerned, 9-10 liters/minute is recommended as a reasonable rule of thumb.
Cost of gas and cylinder.
- For proper operation of the wire welding machine with gas protection, it is important that the environment where you work is sheltered from the wind, since it may affect the gas flow and damage or ruin the final welding result.
Advantages of no-gas continuous wire welding
The settings of no-gas continuous wire welding machines are the same of those that use gas, so it is important to pay attention to modify the amperage according to the thickness of the wire you are using and its speed.
However, you do not need to worry about gas because the weld pool is protected by the wire core, which is composed of a mix of minerals that, during combustion, create a controlled atmosphere around the weld, covered by a slag that protects the weld bead as it cools down.
The flux-cored wire can therefore also be used in open environments with strong wind without the risk of compromising the result.
Cheaper welding process because it does not require a cylinder, pressure reducer, or gas hose.
The weld bead is less aesthetically pleasing due to the slag and must be cleaned with a brush.
If a job requires several welding steps, you must be sure to have removed all the slag before proceeding with the next step, otherwise the weld strength could be compromised.
