Large Part Welding

Napoleon Machine has the tools and expertise needed to handle most large part welding projects. However, our core focus is metal tube and heavy plate welding, from half-inch to 10 inches (0.25 m). Also, we can handle any part weighing up to 70,000 lbs.

Our success in large part welding has been made possible by expert tradesmen. When dealing with large weldments, an experienced team is essential. For example, large weldments can require a substantial amount of continuous weld, which will result in thermal expansion, and too much growth will cause the part to bend, bow, and warp. Rest assured, our team has hundreds of years of combined large part welding experience. Moreover, every welder holds multiple AWS certificates. If you have a job that calls for WPS/PQR, we have a full-time CWI.

We work hard to service our customers. That means delivering quality parts on time, every time. However, if we make a mistake, we’ll do what it takes to make it right. Please don’t take our word for it; read our customer reviews. Or, if you would like to chat with our team, email Be sure to check out our large part CNC machining before you go.

Play Video about Welding Steel Plate

The right tools for large part welding.

We make sure our team has the equipment needed to win. In this video, owner Kevin Febrey outlines some of the tools we use to succeed in large part welding.  If you want to see more videos like this, subscribe to our YouTube channel.

Large Part Welding | Product Examples

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Large Part Welding Capabilities

We go big.
  • Weight up to 70,000 pounds.
  • Length up to 50 feet.
  • Tolerances up to 0.063 inches.
  • Aluminum
  • Armor Plate
  • Carbon Steel
  • Ductile Iron
  • Grey Iron
  • Hardox Steel
  • Red Metals
  • Stainless Steel
  • Stressproof Steel
  • Tool Steel
  • MIG Welding
  • TIG Welding

Quality built into every process.

Properly inspecting parts is an important aspect of our business. However, if you are catching errors during the inspection process, it is often too late. There are significant expenses associated with rework, and many times errors will lead to late deliveries. This is why we build quality into every process. For example, we have kickoff meetings for each job. Our welders, machinists, programmers, project managers, and painters meet and review technical data in close detail. This helps iron out potential issues on the front end. We have also invested in the BLUCO Floor Rail System, which is a precision modular welding tool.

Inspection Tools:

  • Magnetic Particle
  • FARO Laser Tracker
  • Dye Penetrant
  • Ultra-sonic
  • Liquid Penetrant
  • WPS & PQR

Start to finish metalworking capabilities.

As a job shop, we take on unique jobs that require unique solutions. Therefore, we have built a reliable supply chain that can take on any type of metalworking process that we are unable to handle in-house.

  • CNC Laser Cutting
  • CNC Plasma Cutting
  • Finishing
  • Steel Forming
  • Steel Plate Rolling
  • Steel Saw Cutting
  • Steel Shearing
  • Surface Blasting
  • Surface Grinding
  • Thermal Stress Relieving
  • Waterjet Cutting

Need more info? Check out our sales sheet.

Examples of Large Part Weldments

Here are two examples of our large part welding capabilities. On the right is a 40 by 20-foot steel skid built for the oil and gas industry. Our team put a lot of weld and heat on this product. Yet, they were able to keep the flatness under 1/8 of an inch over the product's entire length and width.

Do we have the certifications needed to work on your large part project?

“I asked our Production Manager to inspect the table top you delivered 2 weeks ago, the results were some of the best we’ve seen. The paint looked good and they arrived well packaged. I wanted to pass along the feedback, which is particularly impressive since this is the first table top you’ve made for us.”

- Conrad

Purchasing Manager

Are short lead times important to you?

Our scheduling tool sends out lead time notices when a machine or department gets low on work.  This allows our customers to take advantage of cheaper rates and faster turn-around.