What's the difference between two-way welding and ordinary welding? Which is better?

Both will do. Secondary welding is better than electric welding. As long as you adjust the voltage and current, you will fall in love with him. One disadvantage is that the full name of the second type of welding is carbon dioxide gas shielded welding, which will blow away carbon dioxide gas. You will be shot when welding. What's more, you will get burned, and the welding is full of such a big gap. You must make up for the second welding. Adjust the current and voltage-turn on the switch on the welding handle and start to rotate. When you want to stop, just press it.