Final answer:
The nurse should take precautions when an MRI is performed on a patient with a history of welding work due to the presence of metal in the body.
Step-by-step explanation:
When a patient with a history of welding work goes in for an MRI, the nurse should take precautions due to the presence of metal in the patient's body.
The powerful magnets used in an MRI machine can interact with metal objects, such as fragments or shrapnel, causing them to move or heat up. In the case of a patient who worked as a welder, there may be metal fragments or particles present that could be affected by the MRI. Therefore, the nurse should ensure that the patient is thoroughly screened and informed of any potential risks before proceeding with the scan.