Carbon dioxide gas flowmeter | CO2 gas shielded welding How to determine the size of carbon dioxide gas during welding

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1. The calculation formula for gas flow rate is as follows: the density of carbon dioxide at room temperature and pressure is 1.977 kg/cubic meter, and the density at 0.8 MPa is 15.635 kg/cubic meter. The total gas consumption in 24 hours is 15 tons, which is converted to a rock volume flow rate of 15000 (type kilogram)/15.635 (kilogram/cubic meter)=959 cubic meters (operating flow rate). According to the uniform gas consumption calculation, the gas consumption per hour is about 40 cubic meters (operating flow rate). If the general gas transportation flow rate is calculated at 10 meters per second, then the pipeline should be a DN40 pipeline. If considering the unevenness of gas consumption, DN50 or DN65 pipelines can be considered. If the flow rate of the pressure reducing valve is calculated according to the standard condition, then a 360 cubic meter pressure reducing valve should be selected. How to determine the size of carbon dioxide gas in CO2 gas shielded welding? The determination of the gas size in CO2 gas shielded welding is mainly based on three core methods: flow meter reading, weld seam forming quality, and welding sound. Observing the flow meter is the most direct and accurate method. The flowmeter is installed on the pressure reducing valve of the gas cylinder, and the displayed value (unit: L/min) is the current gas flow rate. -For thin plate welding (usually referring to 3mm or less), the gas flow rate is generally set at 10-15 L/min. -For the welding of medium and thick plates, the gas flow rate can be appropriately increased to 15-25 L/min

2. Observing the appearance quality of the weld seam after welding can infer whether the gas flow rate is appropriate. Suitable flow rate: The weld seam is

smooth and flat, with even and fine fish scale patterns, and no defects such as pores or undercutting. Low flow rate: Insufficient protection of the melt pool, prone to porosity on the surface of the weld seam, accompanied by signs of blackening and oxidation. • Excessive flow: The airflow creates turbulent flow, which can instead draw in air and cause porosity, and may also blow off the molten pool, resulting in undercutting or poor weld formation.

3. Experienced welders can judge by listening to the sound of the arc and the clanging.

. Suitable flow rate: The arc burns steadily, emitting a smooth and continuous "rustling" sound. • Low flow rate: Due to the mixing of air, the arc is unstable and the sound becomes sharp, accompanied by intermittent "plop plop" sounds. Excessive flow: Strong airflow can be clearly heard, and the sound of electric arcs becomes noisy.

3. Seeking advice on how to calibrate flow meters on carbon dioxide and argon gas regulators

According to the structural characteristics of carbon dioxide gas flow meters, self regulating instruments are classified into two types: self regulating integrated carbon dioxide gas flow meters and self regulating split carbon dioxide gas flow meters.

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