How Do I Choose the Best Gas Welder?

Adopt advanced production technology, reliable performance and strong overload capacity. Suitable for gas shielded welding of various low carbon steels and low alloy steels.

CO2 gas shielded welding machine

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Adopt advanced production technology, reliable performance and strong overload capacity. Suitable for various

High efficiency can make the production efficiency ratio

CO2 protective gas

Carbon dioxide has three states: solid, liquid, and gaseous. Bottled liquid carbon dioxide is the main protective gas source for carbon dioxide welding. Liquid CO2 is a colorless liquid whose density changes with temperature. When the temperature is lower than -11 ° C, the density is greater than water, and when the temperature is higher than -11 ° C, the density is lower than water. Because the boiling point of CO2 from liquid to gas is very low -78 ° C, carbon dioxide for industrial welding is all liquid. Can gasify at room temperature. Carbon dioxide gas cylinders are painted black and marked "CO2" in yellow.

Welding wire

Carbon dioxide gas welding requires the chemical composition of the wire:

(1) The welding wire must contain a sufficient amount of deoxidizing elements to reduce the oxygen content in the weld metal and prevent gas generation.

(2) The carbon content of the welding wire should be low, usually <0.11%, which can reduce porosity and spatter.

(3) Ensure that the weld metal has satisfactory mechanical properties and crack resistance.

At present, the most widely used welding wire in production is H08Mn2SiA welding wire. This welding wire has good process performance, mechanical properties and heat crack resistance. It is suitable for welding low carbon steel, low alloy steel with yield limit <500Mpa and heat resistance after welding Low alloy high strength steel with tensile strength <1200Mpa.

The cleanliness of the wire surface affects the hydrogen content of the weld metal. Welding important structures should use mechanical, chemical or heating methods to remove moisture and contaminants from the surface of the wire.

Flux-cored wire

(1) Because the composition of the drug core changes the physical and chemical properties of the pure carbon dioxide arc, the splash is small and the splash particles are easy to remove.

Because the surface of the molten pool is covered with slag, the welding seam formation is similar to manual arc welding. The welding seam is more beautiful than solid core wire arc welding.

(2) Compared with manual arc welding, due to the high heat resistance of carbon dioxide arc and current density greater than manual arc welding, the production efficiency can be 3-5 times that of manual arc welding.

(3) Adjusting the composition of the flux core can weld different steel types, not as complicated as smelting solid core wire.

(4) Since the molten pool is protected by carbon dioxide gas and slag, the anti-porosity capability is stronger than the solid core wire capability.