Final answer:
Adjacent walls and other surfaces where arc welding is regularly carried out usually have fireproof barriers as protection against the heat and sparks generated during welding.
Step-by-step explanation:
When arc welding is regularly carried out, adjacent walls and other surfaces typically have fireproof barriers to protect against the intense heat and sparks generated during the welding process. These barriers prevent nearby materials from catching fire and ensure that the welding environment is safe for operators and nearby equipment. In contrast to heat-resistant coatings or welding blankets, fireproof barriers provide a more complete and robust solution for areas where high levels of heat and sparks are present. Heat-affected zones refer to the area of the metal being welded which is impacted by the high temperatures, rather than a method of protection for surrounding areas.