How to use hot melt butt welding machine

Update:24 Feb 2022

The use of hot melt butt welding machine: 1. Preparatio […]

The use of hot melt butt welding machine:

1. Preparation for welding

Welding preparation is mainly to check whether the condition of the welding machine meets the working requirements. For example, check whether the fasteners of various parts of the machine are loose or loose; check whether the electrical circuit connection of the whole machine is correct and reliable; check whether the hydraulic oil in the hydraulic tank is sufficient; confirm that the power supply matches the input requirements of the machine; whether the heating plate meets the requirements (Whether the coating is damaged); Trial operation of milling cutter and oil pump switch, etc.

Then put the slips with the same pipe specifications into the rack; set the temperature of the heating plate to the welding temperature (the welding temperature of the polyethylene pipe machine is 200~230℃), before heating, use soft paper or cloth dipped in alcohol to wipe the heating plate surface, but be careful not to scratch the PTFE release layer.

2. Welding

Welding should be performed according to the parameters of the welding procedure card. If necessary, it should be adjusted appropriately according to changes in weather, ambient temperature, etc. The main steps are as follows.

(1) Use a clean cloth to remove the dirt on the ends of the two pipes. Place the pipe in the rack slip, so that the lengths at both ends are the same (it should be as short as possible under the condition of meeting the requirements of milling and heating, usually 25~30mm). If necessary, the parts other than the pipe rack should be held up with supports, so that the axis of the pipe is at the same height as the center line of the rack, and then fastened with slips.

(2) Insert the milling cutter, first turn on the power switch of the milling cutter, then slowly close the welding ends of the two pipes, and apply appropriate pressure until continuous chips appear at both ends, remove the pressure, wait for a while, and then exit the activity Turn off the power of the milling cutter. The chip thickness should be 0.5~1.0mm, and the chip thickness can be adjusted by adjusting the height of the milling insert.

(3) Take out the milling cutter, close the two pipe ends, and check the alignment of the two ends. The dislocation of the two ends of the pipe should not exceed 10% of the thickness of the pipe wall or the larger value of 1mm, which can be corrected to a certain extent by adjusting the straightness of the pipe and the tightness of the slips; there is no obvious gap between the two ends of the pipe when closing. The maximum width cannot exceed: 0.3mm (DN<225mm), 0.5mm (225mm<DN<400mm) or 1.0mm (DN>400mm). If the above requirements are not met, it should be milled again until the above requirements are met.

(4) Measure the drag force (friction resistance of the moving fixture), this pressure should be superimposed on the process parameter pressure to get the actual use pressure. And check whether the heating plate temperature reaches the set value.

(5) After the temperature of the heating plate reaches the set value, put it into the rack and apply the specified pressure until the minimum curling edge on both sides reaches the specified width and the pressure is reduced to the specified value (so that the end face of the pipe and the heating plate are just kept in contact) , to absorb heat.

(6) After the time is up, withdraw the movable frame, quickly take out the heating plate, and then close the two tube ends. The switching time should be as short as possible and should not exceed the specified value. After cooling for the specified time, release the pressure, loosen the slips, and take out the connected pipes.

The features of this welder are:

①The optimal welding parameters of pipes of different materials, diameters and SDRs have been set in advance;

②Automatic control of welding time, temperature and pressure;

③Automatic detection and compensation of drag pressure;

④The heating plate pops up automatically, and the temperature loss is minimized;

⑤Automatic monitoring and prompting of the whole process of each operation step in the welding process;

⑥Quick clamping system improves work efficiency by 30%;

⑦The dynamic data of the welding process can be printed out, or downloaded to the PC of the quality inspector through the data transmission system, so as to review the on-site performance of the welding machine and the operator;

⑧The database can store up to 600 interface related welding parameters.