![]() Wires paired with 100% CO2 provide more weld penetration but also tend to result in more weld spatter, which takes more time to clean. Wires that have both C and M designations are dual-gas wires that can be used with either gas type. Wires with an M designation, such as E71T-1M, require a mixed shielding gas of CO2 and argon, often a 75%/25% ratio. Use only 100% CO2 with wires with a C designation in their AWS classification, such as E70T-1C H8. It’s also important to know the specific shielding gas requirements of the flux-cored wires you’re using. What are the basics of matching a flux-cored wire with a shielding gas? Each type of shielding gas yields different characteristics in FCAW. With proper technique and best practices, flux-cored wires can deliver improved productivity, better weld quality, and reduced downtime. Common options are 100% carbon dioxide or a CO2 and argon gas mix. ![]() FCAW with gas-shielded flux-cored wires requires an external shielding gas. You must remove the slag in between passes and after the final pass to avoid inclusions that could lead to defective welds.Ĭhoose a shielding gas. Flux-cored wires produce a slag that protects the molten weld puddle as it cools. These designators can be a number (from 1 to 14) or a letter (G or GS). Flux-cored wires have usability designators defined by AWS that indicate their polarity and operating characteristics. The wires for welding steel are available in tensile strengths of 70 KSI for mild steel and 80 to 120 KSI for high-strength/low-alloy steels.Ĭheck the designators. Flux-cored wires are available for welding a variety of base materials, including mild steel, low-alloy steel, nickel alloys, and stainless steel. Some flux-cored wires are designed for all-position welding (such as an AWS E71T-1C), while others are designated for flat and horizontal positions (like an AWS E70T-1C). When deciding on the right wire for the job, it’s important to first consider a few flux-cored wire basics. The common rutile-based American Welding Society (AWS) E71T-1 gas-shielded flux-cored wires tend to be very appealing because they are easy to control and produce an aesthetically pleasing weld. ![]() ![]() Understanding the characteristics and benefits of gas-shielded flux-cored wires can help you decide if they are the right fit for your welding operation. These wires are also a good match for applications across many industries, such as shipbuilding, structural steel, and general fabrication and manufacturing. Gas-shielded flux-cored arc welding (FCAW) wires can provide higher deposition rates than other filler metals, resulting in increased productivity for many applications. Key factors to consider when making the choice include your required welding position available welding equipment base material type or grade, size, and thickness and operator skill level. Images: Hobart BrothersĬhoosing the right filler metal can significantly influence the quality of the finished weld, but there isn’t a one-size-fits-all solution for every job.
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