Welding Operations JHA (Job Hazard Analysis / Activity Hazard Analysis)
Updated 2026-06-23
A Welding Operations JHA (Job Hazard Analysis / Activity Hazard Analysis) is the plan that protects the welder and everyone nearby from the fire, the fumes, the radiation, and the electrical hazards that every weld produces. Welding is so routine across construction and fabrication that its hazards are easy to normalize — yet each weld is an open arc throwing intense ultraviolet radiation, a source of toxic fume, an ignition source, and a live electrical circuit. This guide walks through building a Welding Operations JHA that names the fire, fume, radiation, and electrical hazards and assigns the ventilation, fire-watch, and PPE controls that hold up in the field.
Why welding needs its own JHA
A welding arc combines several serious hazards in one operation. It produces intense heat and molten metal that can ignite combustibles and burn the welder. It generates fume and gases — hazardous metal fumes from the base metal, coatings, and filler. It emits ultraviolet and infrared radiation that burns skin and eyes. And arc welding runs an electrical circuit through the equipment and the work, creating a shock hazard, especially in wet or confined conditions. Each of these requires its own control, and a generic "welding is hot work" briefing addresses only the fire. While welding is a form of hot work and shares the permit and fire-watch controls, the fume, radiation, and electrical hazards deserve their own treatment in a dedicated JHA.
Breaking welding operations into steps
The steps for a Welding Operations JHA follow the weld from setup to cool-down:
- Obtain the hot work permit and survey the area for combustibles
- Set up and inspect the welding machine, leads, and ground
- Provide ventilation or local exhaust for the fume
- Position screens to protect nearby workers from the arc
- Don welding PPE and confirm the correct lens shade
- Strike the arc and weld
- Maintain a fire watch during and after the work
- Inspect the area, allow cool-down, and close the permit
Each step carries a hazard, and the ventilation, the fire watch, and the lens-shade selection are where the welding-specific risks are controlled.
The hazards step by step
Fire and burns
The arc and molten metal ignite combustibles and burn the welder. The controls are the hot work permit, clearing or shielding combustibles within the spark zone, covering openings sparks could travel through, flame-resistant clothing and welding leathers, and a charged extinguisher within reach. As with all hot work, a dedicated fire watch monitors during the weld and continues after the arc is out, because slag smolders.
Welding fume and gases
Welding releases metal fume and gases that are hazardous to breathe. Fumes from mild steel are a hazard on their own; coated, galvanized, stainless, and certain alloyed metals produce significantly more toxic fume — hexavalent chromium from stainless, zinc oxide from galvanized (metal fume fever), and others. Confined or poorly ventilated spaces concentrate the exposure dramatically. The controls are local exhaust ventilation at the arc, general ventilation, respiratory protection matched to the fume, and positioning the head out of the fume plume. Galvanized and coated metals get extra ventilation and, where required, removal of the coating before welding.
Arc radiation
The arc emits intense ultraviolet and infrared radiation. Direct or reflected exposure causes "arc eye" (a painful corneal burn) and skin burns, and it affects nearby workers, not just the welder. The controls are the correct welding helmet with the proper lens shade for the process and amperage, covering exposed skin, and welding screens or curtains to protect workers in the area from the arc flash.
Electric shock
Arc welding runs current through the electrode holder, the leads, and the work. Damaged leads, poor grounding, and wet conditions create shock hazards, which are amplified in confined spaces and on elevated or damp work. The controls are inspecting leads and holders, maintaining a good work (ground) connection, keeping equipment and the welder dry, and following safe procedures for changing electrodes.
A simple Welding Operations JHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Permit and survey | Fire | Hot work permit, clear combustibles, cover openings | OSHA 1926.352 |
| Inspect machine | Electric shock | Inspect leads/holder, good ground, keep dry | OSHA 1926.351 |
| Ventilate | Toxic fume | Local exhaust, ventilation, respirator for the metal | OSHA 1926.353 |
| Set screens | Arc radiation to others | Welding screens/curtains around the arc | OSHA 1926.351(e) |
| Weld | Arc eye / burns | Correct lens shade, FR clothing, cover skin | OSHA 1926.353(c) |
| Fire watch | Smoldering fire | Dedicated watch during and after, extinguisher in reach | OSHA 1926.352(e)(f) |
Fume control and the galvanized trap
A Welding Operations JHA has to take fume as seriously as fire, because the fume hazard is invisible and cumulative. The control hierarchy is ventilation first — local exhaust at the arc to capture the fume at the source — then respiratory protection matched to the specific metal. The galvanized trap deserves special attention: welding on galvanized steel produces zinc oxide fume that causes metal fume fever, and stainless produces hexavalent chromium, a far more serious exposure. A JHA that identifies the base metal and coating, and specifies the ventilation and respiratory protection for it, controls a hazard that a generic welding briefing ignores. Confined-space welding multiplies all of this and triggers confined-space controls on top of the welding controls.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, the welding incidents split between the dramatic and the cumulative. The dramatic ones are the fires — a weld in an area that was not surveyed, sparks traveling to combustibles out of sight, a fire watch that left before the slag stopped smoldering. These follow the hot-work pattern, and the controls are the permit, the survey, and the fire watch that continues after the arc is out. The cumulative hazard is the fume, and it is the one welders themselves most often dismiss because no single weld makes them sick.
The fume failure I see most is welding on galvanized or coated metal without adequate ventilation — the welder gets metal fume fever that night and writes it off, not connecting it to the weld. On the projects I have run, identifying the base metal and coating in the JHA and providing local exhaust at the arc is what protects the welder's long-term health, and it is worth the effort to set up. Arc-eye is the other quiet one: a nearby worker, not the welder, catches the flash because no screen was up, and spends the night with burning eyes. The screen protects everyone in the area. The JHA that controls the fire, captures the fume, and screens the arc is the one that protects the welder today and over a career.
The bottom line
A strong Welding Operations JHA names the fire, the fume, the radiation, and the electrical hazards with specific controls — the hot-work permit and fire watch, local exhaust matched to the metal, the correct lens shade and arc screens, and inspected leads with a good ground. Welding is routine, and its fume and radiation hazards are invisible, which is exactly why they get ignored. The JHA that treats all four hazards is the one that protects the whole crew.
Frequently asked questions
What are the four main welding hazards?
Fire and burns from the arc and molten metal, hazardous welding fume and gases, ultraviolet and infrared arc radiation, and electric shock from the welding circuit. A generic 'welding is hot work' briefing addresses only the fire, which is why the fume, radiation, and electrical hazards need their own controls.
Why is welding on galvanized steel hazardous?
Welding galvanized steel produces zinc oxide fume that causes metal fume fever, and stainless produces hexavalent chromium, a far more serious exposure. The JHA identifies the base metal and coating and specifies local exhaust ventilation and respiratory protection for it — a hazard a generic welding briefing ignores.
What is arc eye and how is it prevented?
Arc eye is a painful corneal burn from ultraviolet radiation, and it affects nearby workers, not just the welder. It is prevented by the correct welding helmet lens shade for the process and amperage, covering exposed skin, and welding screens or curtains that protect workers in the area from the arc flash.
How long must a fire watch continue after welding?
The fire watch monitors during the weld and continues for a period after the arc is out, because slag and hot metal can smolder and ignite combustibles after the work appears finished. Many hot-work programs require the watch to continue for at least 30 minutes or longer.
Related JHAs
- Hot Work JHA — the permit and fire-watch framework for welding, cutting, and grinding
- Grinding and Abrasive Wheel Operations JHA — grinding that pairs with welding
- Structural Steel Bolt-Up JHA — welded versus bolted connections
- Confined Space Entry JHA — welding fume control in confined spaces
Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.