
Ensure the safety, durability, and compliance of your structural connections with our expert Welding & High-Strength Bolting Inspection Services.
Welding & High-Strength Bolting Inspection Services
We specialize in verifying that welded and bolted connections meet engineering specifications, industry standards, and building codes.


✅ Welding Inspections – Verifying weld quality, size, continuity, and compliance with AWS D1.1, D1.3, and other standards.
✅ High-Strength Bolting Inspections – Ensuring proper bolt installation, tightening procedures, and compliance with AISC & RCSC guidelines.
✅ Non-Destructive Testing (NDT) – Using advanced techniques such as Ultrasonic Testing (UT), Magnetic Particle Testing (MT), and Dye Penetrant Testing (PT).
✅ Field & Shop Welding Inspections – Examining welds on-site and in fabrication shops to ensure code compliance.
✅ Torque & Tension Verification – Testing high-strength bolts to ensure correct preload values.
✅ Code Compliance Reports – Providing certified inspection reports for engineers and city officials.

We utilize Skidmore-Wilhelm Bolt Tension Testers to verify that high-strength bolts achieve the required preload before installation. This ensures compliance with industry standards such as ASTM F3125, AISC, and RCSC.
🔹 How It Works:
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The bolt, nut, and washer are placed into the test device.
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The bolt is tightened using the specified method (turn-of-nut, DTI washers, Tension control bolts or calibrated wrench).
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The machine measures actual bolt tension (preload), ensuring it meets required values.
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Results confirm compliance and prevent joint failures due to under- or over-tightening.

✔ Certified & Experienced Inspectors – AWS-CWI & ICC Special Inspectors with extensive industry knowledge.
✔ Advanced Testing Equipment – Utilizing Skidmore-Wilhelm devices and NDT methods for precise inspections.
✔ Fast & Reliable Service – Quick response times and comprehensive reporting.
✔ Compliance & Quality Assurance – Ensuring structural integrity and safety for all projects.
✔ **Serving Commercial , Industrial & Residential Projects ** – From high-rise buildings to infrastructure projects.
📍 Areas We Serve
We provide welding and bolting inspections throughout Los Angeles City, Los Angeles County, Orange County, Riverside County, and San Diego County. We ensure compliance with local jurisdictional requirements and provide a 1-hour response guarantee in the following areas:
Los Angeles County | Orange County | Riverside County | San Diego County

Head Office
2510 West California Street ,
Santa Ana California,
administration@erjinspections.com
Office: (714)858-4696
Cell Phone: (951)4270646
HOURS
Monday-Friday: 8:30am-5:00pm
Saturday: 9:00 am - 2:00 pm
Sunday: Closed
Get a quote: (951) 427-0646
📞 Schedule Your Inspection Today! Contact us for expert Welding & High-Strength Bolting Inspections to ensure your project meets code and structural integrity requirements.