Is it best practice to use the manufacturer's recommendations for changing out FCAW liners?

• A. True
• B. False
• C. Not sure
• D. Sometimes

Answer: (A)

Following the manufacturer's recommendations for changing FCAW liners is best practice because the liner is a wear part that directly influences wire feeding and overall welding performance. Over time, the liner wears from the moving wire, can accumulate debris, and may deform in bends. A worn or dirty liner increases friction and can cause irregular wire feed, bird nesting, or feeding hesitations, which lead to inconsistent arc performance and weld quality. The manufacturer designs liners to match specific wire diameters, performances, and gun configurations, so their suggested replacement intervals reflect tested limits that keep feed smooth, voltage/current stable, and the process reliable. Sticking to these guidelines helps minimize downtime, maintain consistency, and protect warranty. If you notice obvious wear or feeding problems, inspecting and replacing earlier is reasonable, but the baseline is to follow the manufacturer’s recommendations.