Classification of filler metals according to gas type, self-shielded flux cored electrodes, no need for any shielding gas
Release time:
2022-08-30
【Summary Description】 Filler metals are classified by gas type. Since 2005, the American Welding Society's core filler metal classification has included the shielding gas type into the electrode classification symbol. Mild steel FCAW-G electrodes have an AWS number of EXXT-XX and the last symbol indicates the type of shielding gas. If the last digit is C, the shielding gas is CO2. If M, it represents an Ar/CO2 gas mixture (e. g., E71T-1C or E71-T1M). For low alloy steel electrodes, the shielding gas symbol corresponds to the final deposited metal composition symbol of the specified symbol (e. g. E81T1-Ni1C). In contrast, self-protected drug-cored electrodes do not require any shielding gas, and there is no shielding gas code (such as E71T-8) in their classification number. Some electrodes can only be protected with CO2. Some electrodes can only be protected with an Ar/CO2 gas mixture. Some electrodes can be protected by CO2 gas or Ar/CO2 mixed gas at the same time. In this case, the electrode must meet both classification requirements. When choosing a shielding gas in a FCAW-G application, one should not only consider the cost of the gas, but should consider the three aspects discussed in this article. How each gas type affects the total cost of welding. Which gas can reduce the cost per meter of weld? Some manufacturers have found that Ar/CO2 mixed gas shielding can improve weld quality and productivity. Other manufacturers believe that the advantages of Ar/CO2 mixed gas welding are not ideal, or the cost is not as low as CO2 gas welding. However, for other manufacturers, CO2 is cheap and suitable for some of their welding applications. For users of the FCAW-G process, the shielding gas should be selected according to the impact of the shielding gas on the cost, quality and productivity of the welding operation. Once the shielding gas has been selected, the FCAW-G electrode shall be suitable for welding with that gas.
Filler metals are classified by gas type.
Since 2005, the American Welding Society's core filler metal classification has included the shielding gas type into the electrode classification symbol. Mild steel FCAW-G electrodes have an AWS number of EXXT-XX and the last symbol indicates the type of shielding gas. If the last digit is C, the shielding gas is CO2. If M, it represents an Ar/CO2 gas mixture (e. g., E71T-1C or E71-T1M). For low alloy steel electrodes, the shielding gas symbol corresponds to the final deposited metal composition symbol of the specified symbol (e. g. E81T1-Ni1C). In contrast, self-protected drug-cored electrodes do not require any shielding gas, and there is no shielding gas code (such as E71T-8) in their classification number.
Some electrodes can only be protected with CO2. Some electrodes can only be protected with an Ar/CO2 gas mixture. Some electrodes can be protected by CO2 gas or Ar/CO2 mixed gas at the same time. In this case, the electrode must meet both classification requirements.
When choosing a shielding gas in a FCAW-G application, one should not only consider the cost of the gas, but should consider the three aspects discussed in this article. How each gas type affects the total cost of welding. Which gas can reduce the cost per meter of weld? Some manufacturers have found that Ar/CO2 mixed gas shielding can improve weld quality and productivity. Other manufacturers believe that the advantages of Ar/CO2 mixed gas welding are not ideal, or the cost is not as low as CO2 gas welding. However, for other manufacturers, CO2 is cheap and suitable for some of their welding applications. For users of the FCAW-G process, the shielding gas should be selected according to the impact of the shielding gas on the cost, quality and productivity of the welding operation. Once the shielding gas has been selected, the FCAW-G electrode shall be suitable for welding with that gas.
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