Fabricated metal manufacturing (NAICS 332) includes stamping, forging, screw machining, and structural metal fabrication — all sectors with significant noise exposure from impact and grinding operations. Mechanical stamping presses are among the loudest sustained noise sources in any industry, OSHA 29 CFR 1910.95 applies to metal fabrication operations as general industry. According to CDC/NIOSH, approximately 22 million U.S. workers are exposed to hazardous occupational noise annually.
Soundtrace delivers in-house audiometric testing and noise monitoring for metal fabrication operations — ANSI S3.1-compliant, automated STS detection, and licensed audiologist review.
Noise Sources and TWA Ranges: Metal Fabrication
| Equipment / Process | Typical Level | Typical 8-hr TWA | OSHA Status |
|---|---|---|---|
| Mechanical stamping press (impact) | 100–120 dBA | 95–110 dBA | Far exceeds PEL — among loudest in manufacturing |
| Punch press / turret punch | 95–115 dBA | 92–108 dBA | Significantly exceeds PEL |
| Shear / notcher / brake press | 90–105 dBA | 88–98 dBA | At or above PEL |
| Plasma / laser cutting | 85–100 dBA | 85–95 dBA | At or above action level |
| Welding (MIG/TIG) | 82–95 dBA | 82–92 dBA | At or above action level |
| Grinding / deburring | 90–105 dBA | 88–98 dBA | At or above PEL |
| Powder coating / painting | 78–88 dBA | 78–86 dBA | Monitor; exhaust fans vary |
Industry-Specific Compliance Considerations
Fabricated metal manufacturing (NAICS 332) includes stamping, forging, screw machining, and structural metal fabrication — all sectors with significant noise exposure from impact and grinding operations. Mechanical stamping presses are among the loudest sustained noise sources in any industry, with peak levels reaching 120+ dBA during impact. Workers in stamping shops develop occupational NIHL rapidly, and the WC liability for stamping employers is substantial. Job shops and contract manufacturers in this sector often lack formal HCPs because they don't perceive themselves as 'manufacturing plants' in the traditional sense — but OSHA 1910.95 applies regardless of company size or business model.
OSHA 1910.95 Requirements
All metal fabrication workers at or above the 85 dBA action level require the full six-element OSHA 1910.95 hearing conservation program. Workers above the 90 dBA PEL require documented engineering controls assessment. The most common citation patterns across metal fabrication match the broader manufacturing pattern: late baseline audiograms, annual audiogram schedule failures, and inadequate HPD for PEL-exceeding exposures. See: most common OSHA hearing conservation citations.
| Violation Type | Citation Frequency | Typical Penalty (2026) |
|---|---|---|
| Late or missing baseline audiograms | Very high | $2,000–$7,000 per instance |
| Annual audiogram schedule failures | High | $2,000–$7,000 per instance |
| No noise monitoring (assumed below AL) | High | $1,000–$5,000 |
| No engineering controls assessment above PEL | Moderate | $3,000–$9,000 |
Workers’ Compensation Defense
Metal fabrication workers, particularly those in stamping operations, develop occupational hearing loss at high rates from impact noise. Small and mid-size job shops often have no audiometric records from early years of operation, making apportionment defense against WC claims from long-tenure workers very difficult.
Occupational hearing loss claims arrive decades after exposure begins. Records held by mobile van vendors cannot be guaranteed beyond the active vendor relationship. Cloud-based retention with employer-controlled access is the only reliable long-term solution. See: workers’ compensation for occupational hearing loss.
In-house audiometric testing for metal fabrication operations
Soundtrace delivers OSHA-compliant audiometric testing and noise monitoring for metal fabrication employers — automated STS detection, 30-year cloud retention, and licensed audiologist supervision.
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