4. Which of the following Is NOT a recommended practice for fire prevention in SMAW welding? A. Using a fire -resistant blanket to cover flammable materials B. Confirming metal scrap is cold before disposal C. Ensuring a valid fire extinguisher is nearby D. Using oxygen to blow off the workpiece

The correct answer is D. Using oxygen to blow off the workpiece.<br /><br />Explanation:<br />A. Using a fire-resistant blanket to cover flammable materials is a recommended practice for fire prevention in SMAW (Shielded Metal Arc Welding) welding. It helps to contain any sparks or flames that may occur during the welding process.<br /><br />B. Confirming that metal scrap is cold before disposal is also a recommended practice. This ensures that there are no hot materials that could potentially ignite and cause a fire.<br /><br />C. Ensuring that a valid fire extinguisher is nearby is another recommended practice. In case of a fire, it is crucial to have a fire extinguisher readily available to quickly put out the fire.<br /><br />D. Using oxygen to blow off the workpiece is NOT a recommended practice for fire prevention in SMAW welding. Oxygen can actually increase the risk of fire and should never be used in this context.