When it comes to the durability and performance of excavator attachments, particularly long arms and boom extensions, one factor often determines success or failure: the quality of the welds. At Dewanda, welding is not treated as a routine manufacturing step. It is an integral part of the brand’s identity. Every Dewanda arm that leaves the workshop is the result of meticulous engineering, years of hands-on experience, and a commitment to quality welding technology that few manufacturers can replicate.

A Reputation Forged in Steel

Dewanda has built its name in the excavator parts and attachment industry with a laser-sharp focus on long arms, booms, and custom structural components. With clients in over 30 countries, many of whom operate under extreme site conditions—mining, demolition, deep trenching, and municipal infrastructure—our products need to do more than just fit. They need to last. And they need to perform like new, even after thousands of hours of intense field work.

Much of that trust stems from one invisible—but essential—aspect: the welds.

The welding seams on every Dewanda arm aren't just functional—they are a signature of the brand. They hold together tens of tons of steel under enormous pressure, torque, and environmental wear. So we take it seriously.

Welding Technology at Dewanda: Where Craft Meets Precision

Dual-Welding Philosophy: Hand + Machine

Dewanda adopts a hybrid welding system that combines skilled manual welding and robotic automated welding. This isn’t simply for efficiency—it’s a strategic decision based on the strengths of each method.

Manual Welding is deployed in areas where experience, sensory feedback, and human judgment are essential—such as reinforcing gussets, joint overlaps, and interior box welds.

Robotic Welding is used for long continuous seams, symmetrical arms, or large-batch production. These machines deliver consistent penetration, minimal spatter, and perfectly repeatable weld geometry.

This dual approach offers flexibility, efficiency, and unmatched quality. Each Dewanda arm benefits from the best of both worlds: the finesse of a human hand where it matters, and the faultless repetition of robotic precision in critical load-bearing zones.

Weld Types and Joint Structures

The most commonly used welds in Dewanda arm manufacturing include:

Full penetration butt welds, especially in boom main bodies

Fillet welds for reinforcement plates and rib structures

Groove welds in deep V joints where two thick plates meet

Plug welds for overlapping connections

Welding sequences are calculated to control heat distortion. Fixtures are preheated to appropriate temperatures to prevent cracking, especially when joining different thicknesses or high-strength steels.

We work mainly with Q355B, Q460, and sometimes wear-resistant plates like NM400. Each steel type demands a different welding preheat, filler wire, shielding gas combination, and cooling schedule. That knowledge—accumulated through hundreds of field trials—is part of Dewanda’s internal database.

Process Monitoring and Internal Standards

Every robotic welding station at Dewanda is programmed with detailed parameters—travel speed, arc voltage, current settings, torch angles, and oscillation—based on past projects. Real-time arc sensors monitor heat input to avoid undercutting or burn-throughs.

Manual welders, on the other hand, are all certified and undergo regular evaluation not just on technique but on their familiarity with Dewanda's internal quality manuals. No two arms are exactly the same. Depending on the customer’s excavator model, attachment type, or operating load, welding specs are adjusted—and every technician is expected to know these differences.

All welds undergo ultrasonic testing (UT), magnetic particle testing (MT), or X-ray inspection, especially on structural pivot points. We also maintain samples of critical weld cross-sections from random batches to evaluate internal penetration over time.

Building a Brand Around Structural Integrity

At Dewanda, we don’t advertise "strong welds" as a marketing gimmick. We let the results speak through machine hours logged in the field. A single arm might withstand over 3000 working hours per year on a 20-ton excavator, digging into compacted soil, lifting concrete slabs, or working underwater on marine foundations.

We’ve had customers in the Middle East running Dewanda long arms on 24/7 operations, with temperatures exceeding 45°C and ambient sand infiltration, and they’ve returned after two years to order 10 more—without a single weld crack reported. That’s not just good welding; that’s structural integrity born from experience.

Our clients often tell us: "Your arms just look stronger." What they mean is this—clean, wide weld beads with uniform spacing, the absence of visible porosity, and consistent toe blending. These are signs that, even before paint is applied, the arm is already dependable.

Global Feedback: What Clients Notice

Case: Iran – Skeleton Buckets and Arm Combo

One mining client in Iran recently received five skeleton buckets paired with Dewanda long arms for their 22-ton machines. Their feedback highlighted not just the performance of the buckets, but the welds on the arms. According to their maintenance chief:

“Our local suppliers often provide arms that bend or develop hairline cracks after 6 months. Dewanda’s arms have tight weld seams, smooth finishes, and reinforcement in all the stress zones. We checked the welds before use and again after 1000 hours—still perfect.”

Case: Southeast Asia – Deep Excavation Arms

In water-logged construction zones in Southeast Asia, customers often use 15-meter Dewanda extension arms for deep trenching. The constant hydraulic stress and muddy pull make welding seams particularly vulnerable. Here, Dewanda’s box-welded reinforcement ribs have been praised:

“We can tell you use robot welds on the seams—they’re dead straight. But where you hand-weld, like inside the joints, it’s solid and overbuilt. That’s the difference between a custom fabricator and a mass producer.”

Case: Northern Europe – Demolition Boom Kit

A customer from Norway used a Dewanda long-reach kit on a 30-ton demolition excavator. The steel debris, vibration, and multi-attachment switching put extraordinary strain on the arms. After 18 months, the original welds remained intact.

“We didn’t have to grind or re-weld anything. Not even one hairline fracture. The precision and quality control are world-class.”

Internal Training and Welding Culture

It’s not just about the machines or the specs—it’s the people. Dewanda invests heavily in training welders and supervisors. New hires shadow senior welders for months. We hold in-house competitions and performance evaluations every quarter, not for bonuses—but for pride.

We also make sure welders understand not only how to weld, but why certain seams matter more. For instance, a top plate fillet near a hydraulic cylinder mount will carry exponentially more dynamic load than a flat plate seam. Every worker on the line knows these priorities.

There’s a culture of precision that gets passed down internally. A Dewanda welder isn’t just someone who joins metal—they understand they are building the backbone of a machine that someone will rely on for years, under dangerous or high-stakes conditions.

Looking Ahead: Welding Innovation

We’re not stopping where we are. Dewanda is exploring dual-wire robotic welding systems for thicker arm sections to reduce cycle time and increase bead volume. We’re also piloting AI-integrated sensors for real-time defect detection during robotic passes.

For custom orders, especially in marine and tunneling applications, we’re working on thermal post-weld treatment systems to relieve stress on multi-layer welds. These aren’t gimmicks—they're responses to real challenges our clients face.

Our philosophy is simple: if a Dewanda arm fails at the weld, we take it personally. That’s why we go above and beyond to make sure every seam, bead, and joint not only meets industry standards—but becomes a new standard for our customers.