Final answer:
To fix a 'cold' weld that lacks proper fusion, the amperage should be increased to provide more heat for better fusion. It's important to balance the heat to avoid too little or too much, which could compromise the weld quality.
Step-by-step explanation:
To correct a weld that is high and has little or no fusion because it is too 'cold', one should increase amperage. Increasing the amperage will provide more heat to the weld area, thereby promoting better fusion between the materials being welded. It's crucial to achieve the right balance because too much heat can lead to burning through the material, while too little will result in a weak weld as described. Welding requires precise control over several variables, including but not limited to amperage, voltage, and travel speed, to create a strong and durable weld.