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Root Causes of Slow Temperature Rise of Polymer Diffusion Welders
Jul 14,2026
Heating rate is a core performance indicator of polymer diffusion welders, which directly determines welding efficiency, joint quality and production schedule.
1 Malfunctions of Heating System
1.Aging, oxidation or fracture of heating elements leads to insufficient heat output and slow temperature rise.
2.Uneven layout & offset installation of heaters cause unbalanced heat distribution and local slow heating.
3.Loose/oxidized terminals increase contact resistance and block heat transfer.
2 Abnormal Temperature Control System
1.Damaged/aged temperature sensors or improper mounting position mislead temperature controllers, failing precise regulation.
2.Improper PID parameter tuning results in slow system response and delayed power adjustment.
3.Internal control faults cause temperature feedback lag and insufficient heat compensation.
3 Power Supply Failures
1.Unstable workshop mains voltage leads to insufficient heating power.
2.Aged power cords, loose circuit contacts, blown fuses or defective solid-state relays block power supply.
3.Undersized power regulator cannot sustain stable full heating output.
4 Insulation & Environmental Factors
1.Aged/damaged thermal insulation cotton, loose furnace door seals cause massive heat loss.
2.Ambient temperature too low or strong air flow around the machine accelerates heat dissipation and prolong heating time.
5 Process & Operation Factors
1.Workpieces exceed machine design thickness/load or have ultra-high thermal conductivity; absorbed heat cannot be replenished timely.
2.Non-standard operation leads to continuous heat loss and interrupted temperature rise.
Key Troubleshooting Procedures
1.Test resistance & heating status of all heating elements; replace damaged parts. Fasten oxidized loose terminals and clean oxide layers.
2.Calibrate temperature sensors and adjust mounting positions; retune controller parameters or replace faulty temperature modules & relays.
3.Measure input voltage to meet rated standard; repair broken wiring, replace fuses, verify power regulator load matching.
4.Repair damaged insulation and sealing parts; relocate machine away from low temperature & draught areas. Standardize operation: preheat machine in advance, avoid opening furnace door during heating.
5.Match workpiece size and thickness within equipment rated load.
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Wuxi HAIFEI Intelligent Equipment Co., Ltd.
Wuxi HAIFEI Welding Equipment Co., Ltd.
Add: 28 Shuiyun Road, Yuecheng, Jiangyin, Jiangsu Province, China. (Postal Code: 214404)
Mobile: +86 18915302352
Email: wushijie@jshaifei.com