320.253.2699 sales@c4weld.com

Testing & Inspection Services

Welding Inspection By AWS Certified Inspectors

Quality is the highest priority for us. This is demonstrated by having American Welding Society (AWS) Certified Weld Inspectors (CWI) on staff. The benefits of doing so include the following: the ability to conduct in‐process inspections both during welding cycles and at critical control points; and the opportunity to document findings throughout the process.

We can provide documentation at any point during the process to validate that the product is being manufactured to the drawings and specifications provided.

Proactive Non-Destructive Testing

We operate well‐managed programs that ensures top‐quality results. The following are Non-Destructive tests performed onsite or in‐house:

Magnetic Particle (MT)

By running a magnetic current to find flaws and cracks on the surface and near-surface of ferromagnetic materials

Liquid Penetrant (PT)

Produces flaw indications with liquid colored or fluorescent dyes

Ultrasonic Test (UT)

Using special equipment to create high frequency sound waves to penetrate material thickness

Visual Test (VT)

Trained visual inspectors use their knowledge, designs and product documents for inspections using their vision

Other testing

Functional, Hydro, and Proof Testing

Quality Systems

Our facility, welding engineers and certified welders have the highest certifications.

Standard for Non-Pressure Vessel Applications

Our Standard quality program is qualified to MIL‐I‐45208 and is ISO 9001:2015 certified.

ASME for Pressure Vessels

Our manufacturing facility conforms American Society of Mechanical Engineers Section VIII, Division I (ASME “U” Stamp) for in shop and field fabrication of pressure vessels. “U” Stamped Vessels are altered and repaired in accordance with the National Board Inspection Code (NBIC “R” Stamp).

Certificates of Authorization

  • “NB” Mark (National Board)
  • “U” Stamp; “R” Stamp.

Tell us About Your Next Project

Our dedicated and knowledgeable team’s welding, machining and manufacturing experiences allows us to manage and build your projects on time while keeping your specifications in mind.
Ready to begin

Value Engineering

Cost-Reduction Analysis & Design

Critical Welding

National Reputation for Weld Excellence

Performance Testing

Products Tested to Expected Performance

NDE Inspection

Evaluation without affecting serviceability

About C4 Welding, Inc

C4’s original owner focused his business activities on providing high‐precision “critical” welding services. The portfolio of former and current customer projects is a roster of leading companies across many industries.

Over the years, C4 has consistently added more and more depth to our solutions, including large and small part machining services, manufacturing engineering, mechanical design, assembly, OEM manufacturing, and fabrication services. After the purchase of the Company from the original owner in 2013, C4 has accelerated the range of in-house manufacturing and engineering capabilities with the purchase of a 5 axis bridge mill, 2 vertical machining centers, manual lathes, the installation of a paint booth and more, we can handle your project in house from start to finish.

Contact Us

Street Address: 11 Industrial Blvd. | Sauk Rapids, MN 56379 USA

Phone: 320.253.2699 | Fax: 320.253.4804

Sales-Related Inquiries: 320-253-2699 | Emailsales@c4weld.com

Human Resources-related Inquiries: 320-253-2699 | Emailhr@c4weld.com

Hours of OperationMonday – Friday: 8:00am – 4:00pm

Need Manufacturing Services? You Ask, We Answer!

ISO 9001:2015 Certified Quality Systems


Street Address: 11 Industrial Blvd.

Sauk Rapids, MN 56379 USA


Main Phone: 320.253.2699

Fax: 320.253.4804


Sales-Related Inquiries: 320-253-2699 

Email: sales@c4weld.com


Human Resources-related Inquiries:

320-253-2699 Email: hr@c4weld.com