What should be used when welding near flammable materials that cannot be moved?

When welding near flammable materials that cannot be relocated, it is crucial to use fire-resistant shields such as sheet metal. These shields provide a barrier that protects the flammable materials from sparks, slag, and heat generated during the welding process. By using fire-resistant shields, a safe working environment is maintained, minimizing the risk of ignition and fire hazards.

While it is essential to avoid welding in locations where flammable materials are present, it is sometimes necessary to do so if appropriate precautions are taken. Fire-resistant shields are specifically designed to withstand high temperatures and reduce the chances of fires breaking out, thereby providing an effective solution in such scenarios.

Other methods, such as water curtains, may not always provide sufficient protection in high-heat applications typical of welding. Plastic sheets are not suitable as they can easily catch fire or melt, thus failing to serve as an effective barrier. Therefore, using fire-resistant shields is the best method for ensuring safety when welding near immovable flammable materials.