Sometimes you cut of one side, or even both sides of a bolt through joined parts and they are still rusted in place. An air hammer/chisel or electric equivalent is very similar to a hammer drill but the tip doesn’t rotate.
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Amazon.co.uk
4.0
£89.99
SDS-Plus 1500W Heavy Duty Rotary Hammer Drill 1-1/4 Inch 32MM, Safety Clutch 4 Functions with Vibration Control Including Grease, Chisels and Drill Bits with...

Amazon.co.uk
4.0
£79.99
JCB 1050w Rotary Hammer Drill, 240v, Anti-Vibration & Multi Position Side Handle, 4 Modes Drilling, Hammer, Chiselling and Chisel Adjustment, 3 Year Warranty