Final answer:
The approximate travel angle used to weld a butt joint in the flat welding position is 90 degrees.
Step-by-step explanation:
The approximate travel angle used to weld a butt joint in the flat welding position is 90 degrees. This means that the electrode or welding torch is tilted at a 90-degree angle from the joint.
When welding a butt joint in the flat position, a 90-degree angle is commonly used because it allows for better penetration and fusion between the two pieces of metal.
It's important to note that the travel angle may vary depending on the thickness and type of metal being welded, as well as the welding process being used.