Overhead flux cored arc welding is a pretty difficult position to weld in! There are many things that need to be done in order to get a quality weld and using the right technique is the most important part of getting the job done right.
Before even attempting to weld over head there are two main things that need to be done first and they are:
- Joint preparation
- Machine set-up
When it comes to flux cored arc welding joint preparation is typically not a big issue! This welding process can burn through rust, mill scale and even a light coating of dirt. This is one of the main attractions of this metal joining process and that is why many job sites use it. When it comes to the overhead position this welding process does not do well with anything but a clean joint. Even though other positions allow easy welding with a less than perfect joint, overhead will not only be difficult to weld in but chances are you will get some serious burns from molten metal falling. This is because gravity is no longer working in your favor and anything that prevents the filler metal from entering the joint will reject it.
Machine set-up for overhead must be precise. Flux cored welding in most cases does not require a perfectly set-up machine except for the overhead position. The voltage and wire feed speed must be set so that there is a deep crackling sound to the weld just like a stick welder. The wire must be fed fast enough to avoid the globular transfer and slow enough not to overfill the joint. Anything outside of these parameters will result in either too much metal depositing or not enough wire hitting the joint that will cause a ton of spatter clogging the nozzle of the handle.
Proper Welding Techniques for Overhead Flux Cored Arc Welding
The best technique used for the overhead position is a slight side to side weave that produces a tight stringer bead. The tight weaving technique allows the weld to spread properly and keeps the weld uniform. It also allows the welder to control…