In Australian caravan construction, welded aluminium frames (using box sections) are generally considered more durable and rigid than riveted (SPR) aluminium frames, offering better resistance to stress and damage, especially for off-road use. 

Here's a more detailed comparison:

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Welded Aluminium Frames:

• Construction:

  Aluminium box sections (SHS and RHS) are welded.

• Advantages:

  • Strength and Rigidity: welding creates strong, stable connections, spreading stress evenly along the frame's thickness and avoiding high stress points common in riveted frames. 

  • Durability: welded frames are less prone to structural issues, especially in challenging off-road conditions. 

  • Corrosion Resistance: Aluminium is naturally resistant to rust and corrosion, making it a good choice for caravan frames. 

• Disadvantages:

  • Cost: welding is a specialist skill and an expensive and time-consuming method. 

  • Weight: While aluminium is lightweight, the box sections used in welded frames can be heavier than some riveted frame designs. 

 

Riveted (SPR) Aluminium Frames:

• Construction: Aluminium frame sections are riveted together. 

• Advantages:

  • Flexibility: Riveted frames can allow for some flexing, which can be beneficial on rough terrain. 

  • Cost: Riveted frames can be a more affordable option than welded frames. 

• Disadvantages:

  • Strength: Riveted frames may not offer the same level of strength and rigidity as welded frames, especially for off-road use. 

  • Stress Points: Rivets can create stress points, potentially leading to cracking or failure over time. 

  • Potential for Loose Rivets: Rivets can sometimes work loose, requiring maintenance or replacement. 

Which is Better?

• For off-road caravans and those prioritizing durability and strength, welded aluminium frames are generally preferred. 

• Riveted frames can be a viable option for on-road caravans or those seeking a more budget-friendly solution, but may not be as durable or strong. 

• AUSCRAFT RV use a combination of welding and lock bolting to achieve both strength and flexibility.