How do you remove the stakes that are welded on?

Just as a point of clarification; the attached stakes are not welded on, they are stamped out of the same piece of material as the edging itself. The tabs that hold the stakes in place are left there after the stamping process. Breaking off the attached stakes is very straight forward and fairly easy; the key is good leverage. Use a hand tool with a long handle, (channel locks, vice grips, crescent wrench). Do not use standard pliers as the handle is too short and you will not achieve good leverage. Attach the tool near the wide end of the stake and secure the entire piece of edging by leaning on it with your weight or place it on the ground and while kneeling, place your foot on it. Then, with the tool attached bend the stake up and down using small motions. DO NOT try and simply pull, or break off the stake as that will be very difficult. Once the stake starts to give a little bit you can move it up and down more and more, and it will snap off as the metal fatigues. There is no need at all for any type of power tool to remove the attached stakes.