A piece of equipment breaks down on an active construction site. The first question that arises is simple: Can we repair it here, or do we need to transport the machine to the workshop? The answer depends on the type of damage, the material, and the on-site conditions. This guide provides a practical comparison of the two options: costs, turnaround times, and the situations in which each is the best choice.
Key Takeaways
- Transporting a machine to a shop can be expensive: flatbed rates in Quebec and Canada average approximately $2.50 to $3.75 per mile in 2025–2026, with short-haul premiums reaching $5 to $12 per mile because of fixed mobilization costs.
- Mobile welding covers most common repairs, including buckets, blades, teeth, frames and lift arms.
- ER70S-6 wire (MIG/GMAW) remains the standard for structural steel, including high-strength grades such as AR400.
- A shop remains the best option for precision welding on highly stressed components or work requiring controlled preheating.
What can mobile welding really accomplish on a construction site?
Modern mobile welding is far more capable than people realize. Thanks to a trailer with a built-in generator—which ensures optimal autonomy on the job site—a qualified technician can perform virtually all routine repairs on heavy machinery.
Bucket repairs (cracks, worn teeth, deformed lips), hardfacing of blades and teeth, and the fabrication of simple steel parts are carried out efficiently on-site. Repairs to frames and lifting arms, as well as welding of lightweight hydraulic components, are also part of this. The quality achieved with professional mobile equipment is comparable to that of a stationary workshop for the vast majority of these applications. Specifically for buckets, our article on excavator bucket repair on-site details the most common scenarios.
How much does transportation to the workshop really cost?
The economic case for mobile welding is often very clear. Transporting a 20-metric-ton hydraulic excavator to a workshop involves round-trip transportation costs that can range from $1,500 to $3,000, depending on the distance. This figure is consistent with flat-rate transportation rates observed in North America, which are expected to range from $2.50 to $3.75 per mile in 2025–2026, with a premium of $5 to $12 per mile for trips under 300 miles (FreightSidekick, 2026).
Added to this are wait times at the repair shop—often 2 to 5 business days—the cost of machine downtime, and disruptions to the project schedule. A mobile welding technician comes directly to your site, assesses the situation, and completes the repair in a few hours. In the vast majority of cases, the machine is back up and running the same day.
When Going to a Repair Shop Is Still the Best Option
It would be inaccurate to claim that mobile welding can do everything. Some jobs require the equipment and controlled conditions of a fixed workshop. Precision welding on high-stress components, such as main boom arms or load-bearing structures, is one such example. So do jobs requiring controlled preheating on high-strength steels, as well as repairs that require precise positioning on a mounting table.
Similarly, if the part to be repaired is too large or too complex to be handled on-site, it must be taken to the workshop. Extreme weather conditions (strong winds, rain, freezing temperatures) also compromise the quality of on-site welding. An honest technician will clearly tell you when the situation is beyond the scope of mobile service.
Mobile Welding or Workshop: How to Choose?
| Criterion | Mobile Welding | Workshop |
|---|---|---|
| Shipping Cost | None ($0) | $1,500 to $3,000 (round-trip) |
| Typical turnaround time | A few hours, on the same day | 2 to 5 business days |
| Buckets, blades, teeth, frames | Yes | Yes |
| High-stress components (boom arms) | Not recommended | Recommended |
| Controlled preheating required | Not available | Available |
| Extreme weather (wind, rain, intense cold) | Compromises quality | Unaffected |
This table simplifies situations that vary depending on the model and the severity of the damage. The general rule remains the same: if the repair is routine and accessible, mobile welding eliminates transportation costs and delays. If it requires a controlled environment, taking the unit to a workshop remains the best option.
Materials and Techniques Used in Mobile Welding
The quality of professional mobile welding depends on using the right materials and techniques. For repairs on standard structural steel, the MIG (GMAW) process with ER70S-6 wire is the most common. It is the most widely used solid wire in North America for carbon steel, including high-strength steels such as AR400 (Harris Products Group).
Hardfacing uses specially formulated electrodes or wires to deposit a layer of very hard alloy onto surfaces subject to abrasion. Chromium-carbide or tungsten-carbide-based alloys are the most commonly used for heavy machinery applications. Chromium carbide generally achieves a hardness of around Hv600, while tungsten carbide offers superior resistance to severe mineral abrasion (SOS Gases, 2026).
Why does a welder’s certification make all the difference?
Whether on a construction site or in a workshop, the quality of a weld depends above all on the welder’s skill. A qualified technician is familiar with joint preparation procedures, the appropriate welding parameters for each material, and techniques for controlling thermal distortion. He or she also knows how to identify situations that are beyond the scope of mobile service and will guide you toward the appropriate solution.
Frequently Asked Questions
How much does it cost to transport a machine to the workshop compared to on-site welding?
Round-trip transportation of a 20-metric-ton machine typically costs between $1,500 and $3,000, in line with North American flat-rate freight rates of $2.50 to $3.75 per mile (FreightSidekick, 2026). Mobile welding eliminates this cost.
What type of welding wire is used to repair high-strength steel such as AR400?
ER70S-6 wire for MIG/GMAW welding is the North American standard for structural steel and works well on AR400 (Harris Products Group).
When is it absolutely necessary to go to a repair shop rather than use a mobile welding service?
When the repair involves a component under high stress (main boom, load-bearing structure), requires controlled preheating, or when weather conditions (strong winds, rain, extreme cold) compromise the quality of the weld.
Does hardfacing work on a construction site?
Yes. Chromium-carbide and tungsten-carbide alloys are effectively applied on construction sites to protect surfaces subject to abrasion, such as buckets and blades (SOS Gases, 2026).
Conclusion
On-site welding is an effective and cost-efficient solution for the vast majority of routine repairs on heavy machinery. It eliminates transportation costs and delays, minimizes equipment downtime, and allows for rapid service at your job sites throughout Quebec. For more complex jobs, an honest technician will refer you to the workshop if necessary.
Do you need a versatile mobile technician? Contact Solution RML in Sherbrooke: we serve all of Quebec.
