HDPE pipe and fitting,PVC pipe and fitting

HDPE (high-density polyethylene) pipe hot melt welding is a permanent connection method that melts the end of the pipe by heating and then applies pressure to fuse it. This technology can form a joint with the same strength as the pipe itself, ensuring the sealing and durability of the pipeline system.

Main advantages

1. High strength: The weld strength is close to that of the parent material

2. No leakage: integrated connection to avoid interface leakage

3. Corrosion resistance: No additional sealing material is required

4. Long life: Synchronous aging with HDPE pipe (more than 50 years)

 

Classification of hot melt welding methods

(1) Butt hot melt welding (Butt Fusion)

Applicable pipe diameter: generally ≥90mm

Process flow:

End milling - use a milling cutter to ensure that the pipe end is flat and vertical

Heating plate heating - heating to 210±10°C (depending on the material)

Endothermic stage - maintain pressure to form a molten flange at the pipe end

Switch plate removal - quickly remove the heating plate

Welding pressurization - dock within the specified time and cool under pressure

Key parameters:

Step	Pressure (bar)	Time
Heating	0.15~0.3	Adjust based on wall thickness
Soaking	Maintain	Wall thickness (mm) × 10 (seconds)
Cooling	Natural cooling	≥ Wall thickness (minutes)

 

(2) Electrofusion

Applicable scenarios: small diameter or complex locations

Features:

Use pipe fittings with built-in heating wire

Heat after power is turned on to fuse the materials

Operation points:

Scrape off the oxide layer (use a special scraper)

Mark the insertion depth

Power on for heating (voltage/time according to the manufacturer"s instructions)

Natural cooling (forced cooling is prohibited)

 

Key points for welding quality control

(1) Pre-welding inspection

Material verification: Confirm that the pipe/fitting is the same grade PE100 or PE80

Environmental requirements:

Ambient temperature > -5? (a shed needs to be built for insulation in cold weather)

Relative humidity < 90%

Wind barriers need to be set up in windy weather

(2) Process control

Temperature monitoring: The surface temperature of the heating plate needs to be calibrated with an infrared thermometer

Flange shape: A qualified flange should be "double-peaked" with uniform height (reference value: wall thickness × 0.3)

Welding parameters: Strictly follow the requirements of the process card and do not adjust at will

(3) Post-weld inspection

Appearance inspection:

Flanged edges are symmetrical and free of pores

No traces of false welds or carbonization

Destructive test (sampling):

Tensile test (strength ≥ 80% of parent material)

Bending test (no delamination or cracking)

 

Mastering the standardized HDPE hot-melt welding technology is the core of ensuring the quality of pipeline projects.

Official website: www.phtopindustry.com | www.phpipes.com
Contact us: Email:inquiry@phtopindustry.com | Whatsapp:+86 15093100892
Company address: Room 802, 8th Floor, Building 5, Jinyin Modern City, Jinshui District, Zhengzhou City, Henan Province, China