How to Prevent Weld Corner Cracking in UPVC Windows During Winter

Winter brings unique challenges for UPVC windows and doors, especially when it comes to the strength and durability of their welded corners. Low temperatures can make the material brittle and increase internal stress at the weld points, leading to potential cracking. But don’t worry—these risks can be effectively managed with proper precautions.

That hairline crack creeping across your PVC window corner isn’t just a cosmetic flaw—it’s the culmination of molecular stress, thermal drama, and engineering physics playing out in slow motion. For PVC fabricators, weld failures represent the ultimate betrayal of a material that promises simplicity but demands respect.

That frustrating moment when welded UPVC corners refuse to sit flush isn’t just an annoyance—it’s a physics puzzle that separates professional fabrication from amateur attempts. The secret to glass-smooth joints lies not in the welding machine itself, but in the unsung hero called the welding jig.

In the production of UPVC windows and doors, welding is […]

Water leakage around the glazing bead of PVC windows is a common but preventable issue. Understanding the root causes and implementing correct installation practices are essential to ensuring long-term performance, weather resistance, and energy efficiency.

Water leakage at assembly joints represents one of the most persistent challenges in PVC window manufacturing, particularly in complex configurations like balcony windows requiring combined fixed and sliding sections. These designs demand both vertical and horizontal profile connections, creating multiple critical junctions where precision is paramount.

When it comes to the long-term performance of UPVC wind […]

Installing PVC windows might seem straightforward, but improper techniques can lead to **air leaks, water infiltration, and even mold growth**. To ensure long-lasting performance, the **”Plug-in” (Sekou) installation method** is highly recommended—where windows are fitted **after** interior and exterior plastering is complete. This approach demands precision but guarantees a **tighter, more durable seal**.

The three main installation methods – lap joint, […]

PVC windows and doors have gained popularity for their **corrosion resistance, superior sealing, sound insulation, energy efficiency, and affordability**. However, improper installation—especially during renovation—can lead to water leakage, causing headaches for homeowners.