It Is Recommended That ____ Be Worn While Resistance Welding.

Why Eye Protection Matters in Resistance Welding It is recommended that safety glasses be worn while resistance welding to shield the eyes from intense light, flying sparks, and molten metal particles that can cause serious injury. Resistance welding, though often perceived as a low‑risk process compared to arc welding, still generates bright flashes, ultraviolet (UV) radiation, and hot debris that can reach the operator’s face in a fraction of a second. Without proper eye protection, workers risk corneal burns, retinal damage, or even permanent vision loss. This article explains the hazards associated with resistance welding, details the types of eye protection that satisfy the recommendation, and outlines additional personal protective equipment (PPE) and best‑practice guidelines to keep welders safe on the shop floor.

1. Understanding the Hazards of Resistance Welding

Resistance welding joins metals by passing a high current through the workpieces, creating localized heat at the interface. While the process does not produce an open arc, several hazards remain:

Because these hazards can occur in a split second, relying on reflexes or distance alone is insufficient. The recommendation that safety glasses be worn while resistance welding is rooted in the need for a constant, reliable barrier between the eyes and these threats.

2. Types of Eye Protection That Meet the Recommendation

Not all safety glasses are created equal. For resistance welding, the eyewear must address both impact protection and radiation filtering. Below are the most common options that satisfy the safety guideline.

2.1. Welding Safety Glasses (Shade 1.5–3.0)

• Lens shade: Typically a light shade (1.5–3.0) that reduces visible light glare without overly darkening the view, allowing the operator to see the workpiece clearly.
• UV/IR coating: Lenses are treated to block 99.9% of UV‑A/B and a significant portion of IR radiation.
• Impact resistance: Made from polycarbonate or Trivex, meeting ANSI Z87.1 high‑impact standards.
• Fit: Wrap‑around design or side shields prevent peripheral exposure to sparks.

2.2. Welding Helmets with Auto‑Darkening Filters (ADF)

• Shade range: Adjustable from shade 4 (for low‑current resistance welding) up to shade 13 for higher‑intensity processes.
• Response time: <1/25,000 second, ensuring instant protection when the weld initiates.
• Additional features: Grind mode, sensitivity and delay controls, and solar/battery power options.
• Use case: Preferred when the operator performs both resistance welding and occasional arc welding or grinding.

2.3. Face Shields Combined with Safety Glasses

• Full‑face coverage: Protects against larger molten metal splashes and protects the skin.
• Underlying glasses: Safety glasses worn beneath the shield provide UV/IR filtration and impact protection.
• Ventilation: Anti‑fog coatings and airflow channels maintain clear vision.

2.4. Prescription Safety Glasses * Custom lenses: For workers who need corrective vision, prescription safety glasses can be manufactured with the same shading and coating standards as non‑prescription models.

• Compliance: Must still meet ANSI Z87.1 and provide adequate UV/IR protection.

When selecting eyewear, verify that the product is labeled with the appropriate ANSI Z87.1 marking and, if possible, ask the manufacturer for UV/IR transmission data. The key takeaway remains: it is recommended that safety glasses be worn while resistance welding, and the chosen glasses must be rated for both impact and radiation protection.

3. Additional Personal Protective Equipment (PPE) for Resistance Welding

While eye protection is critical, a comprehensive safety strategy includes other PPE to address the full spectrum of hazards.

3.1. Hand Protection * Welding gloves: Made from leather or aluminized fabric, offering heat resistance up to 500 °F (260 °C) and protection against sparks. * Fit: Snug enough to maintain dexterity but loose enough to allow quick removal if overheated.

3.2. Body Protection

• Flame‑resistant (FR) aprons or jackets: Typically made from treated cotton, leather, or synthetic blends that resist ignition and protect the torso from spatter.
• Long sleeves and pants: Prevent skin exposure to UV radiation and hot particles.

3.3. Hearing Protection

• Earplugs or earmuffs: Resistance welding can produce loud clicking or buzzing sounds, especially in high‑volume production lines. * NRR (Noise Reduction Rating): Choose protection with at least 20 dB NRR for continuous exposure.

3.4. Respiratory Protection

• Half‑mask respirators with P100 filters: Capture metal oxide fumes and particulates generated during the weld.
• Powered air‑purifying respirators (PAPRs): Recommended in confined spaces or when welding materials that produce toxic fumes (e.g., galvanized steel).

3.5. Foot Protection

• Steel‑toe, heat‑resistant boots: Guard against falling objects and protect feet from hot slag or molten metal droplets.

Implementing a layered PPE approach ensures that if one line of defense fails (e.g., a glasses lens becomes scratched), other

...barriers remain intact. However, PPE is only one component of a robust safety system. Engineering controls—such as welding curtains, local exhaust ventilation (LEV), and machine guarding—should always be the first line of defense to eliminate or isolate hazards at their source. Administrative controls, including clear standard operating procedures (SOPs), designated welding areas, and strict enforcement of PPE use, are equally vital.

Furthermore, the effectiveness of any PPE program hinges on proper training and fit. Workers must be trained not only on what to wear but also on how to inspect it for damage (e.g., cracks in lenses, worn seams in gloves, degraded filters), how to don and doff it correctly, and its limitations. For respirators, a formal fit-testing program is mandatory to ensure a seal. Regular maintenance schedules and clear protocols for replacing worn or compromised equipment are non-negotiable to maintain protection integrity.

Ultimately, safety in resistance welding is a continuous process of hazard identification, risk assessment, and control implementation. While the radiant energy, sparks, and fumes are inherent to the process, the associated risks are entirely manageable. By selecting PPE that meets or exceeds relevant standards (like ANSI Z87.1 for eye/face and NIOSH for respiratory), integrating it with engineering and administrative controls, and fostering a culture where safety is a shared responsibility, welders can perform their work effectively without compromising their health. The investment in proper protection yields returns in reduced injury rates, compliance, and operational continuity.

Conclusion

Resistance welding presents a complex array of occupational hazards, primarily intense optical radiation, but also thermal, mechanical, and respiratory risks. A comprehensive protection strategy is therefore essential. This begins with certified eye and face protection—shaded safety glasses or goggles meeting ANSI Z87.1, used in conjunction with a welding helmet or shield for added security. This core protection must be systematically augmented with appropriate hand, body, hearing, respiratory, and foot PPE, each selected for the specific material and process. Critically, PPE must be viewed as the final layer in the hierarchy of controls, supporting—not replacing—essential engineering safeguards like ventilation and guarding. The ultimate goal is a holistic safety ecosystem where the right equipment, proper training, and vigilant maintenance converge to allow skilled workers to perform resistance welding with confidence and without harm.