Welders appear to be large men wearing welder's masks, long work gloves, leather aprons stained in blood, grey chest armor, and a similar armor for their legs and feet. Each welder brandishes a weapon resembling the Riveter, but functioning like a flamethrower.
When a player is spotted, Welders will ignite their flamethrowers and begin to move towards the player. Welders' footsteps have a distinct noise that can be used to detect hidden ones. Their primary attack consists of rapidly firing a barrage of fireballs from their flamethrower. These projectiles are colored slightly differently from Cultist fireballs and travel at a faster rate. Welders can be especially dangerous in closed areas where there is not much room to dodge. Upon death, Welders will burst into flames for a brief moment, then explode.
Since Welders have health pool of 400hp, continuous Assault Rifle fire or a single Hunting Rifle shot is enough to bring one down. Additionally, the Sword can be used to deflect most stray projectiles back at the Welder. The Welder's explode-on-death trait can be useful for clearing out smaller enemies that patrol with it, such as Possessed Soldiers, or other Welders.