Re: basement support beam
Yep .... definitley a saftey hazard with kids running around..... getting clotheslined is one thing but those corners are deadly.
To add to Sabo's post .... if you use a sawzall you wouldn't be cutting the welds on the angle iron welded to the posts .... that will be the use for the grinder.
Consentrate on the weld bead and toward the angle iron as a margine of error.
You won't need to grind the welds completely off just to the point they are down enough to use a hammer on the back side of the angle iron to break it free.
Make sure to wear work gloves .... definitely wear eye protection maybe even a face shield and ear plugs while grinding.
"" an ounce of perception -- a pound of obscure "