Welding problems of butt welding flange

Today, a friend asked: after butt welding flange welding, it is found that there are welding slag and burr inside the connecting pipe. How can we clean it? The material of pipe and flange is 316L. Argon arc welding is used for welding. After welding, there are not only burr but also incomplete penetration. Why is this? Is the welder too low?

Flange: butt joint of connecting pipe and butt welding flange. Generally, for pipes with larger diameter, internal groove shall be made for those that can be welded to the inside of the pipe. Welding shall be carried out in the inside first, and then root cleaning and welding shall be carried out outside. Of course, welding slag and burr can also be removed from the inside. If the smaller pipe and flange can not be cleaned inside, the external groove is generally made, and argon arc welding is used for backing, capping or manual arc welding is used for capping. After welding, there are not only burrs, but also incomplete penetration. It is very likely that the level of your welders is limited, or there is a problem with the welding wire (the probability of this situation should be very small). We have never seen this situation every day.

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