broke 906 stud, while drilling broke the bit

you can always try to weld a bolt to it ,buy you will need a stick welder replacing the stick with a bolt its best to have a helper toggle the welder on and off for you. make sure both the new bolt and the old bolt are clean the bolt will also help with removal as it heat the old bolt now before you try to remove it and while its still hot hit it with paraffin wax let cool and try and remove it.I have use this technique many time always with good results....good luck and if your not used to doing this find a friend that can.