Conventional welding: key techniques for the marine sector

Conventional welding remains the backbone of marine and industrial manufacturing. If you need reliable joints on ships, locomotives or cogeneration plants, mastering its techniques will make the difference between a safe asset and a costly breakdown. Follow along.

What is conventional welding and why does it matter?

Conventional welding includes processes such as SMAW, GMAW, GTAW and SAW. Therefore, it remains the most widespread method in European shipyards. Furthermore, it offers a unique balance between cost, versatility and mechanical strength.

Did you know that more than 70% of a merchant ship’s hull is assembled using these processes? For this reason, mastering their parameters is essential.

Applications of conventional welding on ships

In the marine sector, this technique joins ASTM A131 marine-grade steel plates. Likewise, it seals steam pipes in engine rooms and reinforces structures subjected to cyclic fatigue. Similarly, it guarantees the tightness of pressurised fuel tanks.

On the other hand, conventional welding enables on-site repairs during short port calls.

Advantages over automated processes

Although robots are gaining ground, manual welding delivers concrete benefits. However, you should know where it truly excels:

• Full adaptability to complex hull geometries.
• Equipment cost 60% lower than automated systems.
• Operability in confined engine room spaces.
• Direct visual control of the weld pool.
• Quick repairs without reprogramming robotic cells.

Consequently, it remains irreplaceable in corrective maintenance.

Conventional welding in locomotives and cogeneration

Diesel locomotive frames require multi-pass welding with E7018 coated electrodes. In addition, exhaust manifolds in marine turbochargers demand TIG welding with Inconel 625 filler, capable of withstanding gas temperatures up to 980°C.

In cogeneration plants, SAW welding joins fire-tube boiler shells. Therefore, weld quality directly impacts overall thermal efficiency.

Common mistakes you must avoid

Lastly, avoid typical flaws that compromise structural integrity. Likewise, remember that a defective bead can propagate cracks for years.

The most common defects are lack of fusion, moisture-induced porosity and undercut. However, proper preheating between 100-150°C drastically reduces these risks in marine steels.

Standards and certification: meet the requirements

Professional conventional welding requires qualification according to ISO 9606-1 and approval by classification societies. Similarly, WPS procedures must be validated with destructive testing. In short, without certification there is no operational safety.

Do you need certified welders for your next marine or industrial project? Contact us today and request your personalised quote with no obligation. Our team responds within 24 hours.