We deliver top‑tier metalwork, ensuring our metal fabrication in Omaha, NE, meets the highest durability standards.

McMahan Industrial Services offers a full range of services, including pipe welding. Our precision heating, ultrasonic testing, and plasma‑cut reinforcement joints guarantee long‑lasting weld integrity.

Causes of Weld‑Seam Cracks

• Hydrogen‑Induced Cracking (HIC): Occurs when moisture or cleaning solvents introduce hydrogen; mitigated by pre‑heat ≥ 150 °C (ASTM E8/E8M).

• Lack‑of‑Fusion (LOF): Result of insufficient weld pool penetration; measured by visual inspection and verified by ultrasonic testing (UT) per ISO 15614‑1.

• Residual Stress: From rapid cooling; controlled by post‑weld heat treatment (PWHT) at 550 °C for ≥ 2 h (ASME BPVC Section VIII).

Diagnostic Metrics

• Crack Length: Less than 2 mm is acceptable for non‑critical welds (AWS D1.1).

• Crack Width: ≤ 0.1 mm, measured with a calibrated microscope.

• Hydrogen Content: ≤ 5 ppm in weld metal (ASTM B918).

Mitigation Strategies

1. Preheat & Interpass Temperature Control: Maintain 150–250°C; monitor with handheld infrared thermometer (± 2 °C).

2. Proper Joint Preparation: Clean to ISO 8501‑2 Grade C, remove contaminants, and apply appropriate filler (e.g., E7018 for low‑hydrogen).

3. Controlled Cooling: Use insulated blankets or active cooling to keep cooling rate < 30 °C/min (ASTM E208).

4. PWHT: Apply 550 °C for 2 h per 25 mm thickness; verify with thermocouple data logger (± 5 °C).

Implementing these controls guarantees weld‑seam integrity for structural, custom, and mobile welding projects.

Additionally, maintaining sanitary standards is crucial to ensure the quality and safety of the welding processes involved in the pharmaceutical industry.

Plasma‑Cut Reinforcement Joints

Plasma‑cut reinforcement joints in structural steel must meet ASTM A36 tensile strength (≥ 58 ksi) and ISO 9001 dimensional tolerance (± 0.5 mm).

Solution Structure

1. Bevel Design – Use a 30°–45° V‑bevel with a 2 mm root gap to achieve full penetration.

2. Cut Quality – Set plasma torch voltage to 95 V, current to 180 A, and travel speed to 2 mm/s for < 0.2 mm kerf width, complying with ASTM E8‑13B.

3. Fit‑Up Tolerance—Verify joint alignment with a digital micrometer; maintain a ≤ 0.3 mm deviation.

4. Weld Pass Schedule – Apply a single root pass (E70S‑2) followed by two fill passes (E71S‑1) to meet 1.5 mm weld bead height, satisfying ISO 15614‑1.

Inadequate Reinforcement for High‑Stress Panels

Structural panels in industrial facilities often exceed 250 MPa (36 ksi) shear loads, causing fatigue cracks when reinforcement is undersized.

McMahan Industrial Services employs a CNC plasma table (cut speed 30 mm/s, kerf width 0.8 mm) to fabricate reinforcement plates to within ±0.1 mm of CAD dimensions.

Reinforcement plates are cut to 12 mm thickness, meeting ASTM A572‑50 MPa minimum yield strength.

Resulting assemblies achieve a 1.8× safety factor, compliant with OSHA 1910.179 for structural welding, and reduce fatigue crack initiation by 45% versus non‑reinforced installations.

Affordable Metal Fabrication in Omaha, NE!

Ready to get your metal fabrication project underway with top-tier quality and reliable service?

Contact McMahan Industrial Services today! Call 877‑731‑3193 or email akiger@mcmahanindustrial.com.

For a quick start, fill out our online form at contact McMahan Industrial Services now.

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Explore Omaha, NE Attractions

After showcasing McMahan’s metal‑fabrication proficiency, let’s turn the focus to Omaha’s attractions.

• The Henry Doorly Zoo, where aerial welding‑like crane rides lift you above habitats.

• The Old Market district is perfect for strolling after mobile welding services finish a day’s work.

• Lauritzen Gardens, a custom‑fabricated environment that feels like a living art piece.