Heavy close combat weapons are similar to close combat weapons but are particularly massive and used to batter through an opponent's defences. Examples include the Ork choppa and the mighty chainaxe used by Berserkers of Khorne.
There is no armour that can completely protect its wearer against a direct blow from such a weapon and the best hope is to dodge to turn it into a glancing blow. Against a heavy close combat weapon, better armour provides sharply diminishing rewards - the maximum Armour Save that applies against heavy close combat weapons is 4+ and any model with a better Armour Save will only save on 4+.