widos HRG 6 Segment, Working Instructions Translation

Page: 23 / 36

Starting and operating Chapter 5
06/06/19 Working Instructions WIDOS HRG 6, Segment Page 23 of 47

When the prescribed revolving bead height is reached, reduce pressure. For this purpose valve
lever on: “Pressure release“, until the desired heating pressure is built up (heating pressure =
approx. 10% of the adjustment pressure).

The heating time starts now. Press the stop-watch and compare the actual time with the nominal
time taken from the table.

Quickly drive the slide apart after the heating time has expired, control lever with pressed button
on: „BACKWARDS“. Remove the heating element as quickly as possible, put it into the protection
box and close the slides smoothly, control lever on: „FORWARDS“.
The maximum time frame for this process is predetermined by the value for the change over time
taken from the table.

When the welding pressure is built up, press the stop-watch and keep the control lever for
approximately 10s on position „pressure“ so that the hydraulic accumulator can be filled.
During the cooling time re-adjust pressure if necessary (the pressure for cooling is the same as the
set adjustment pressure).

After expiration of the cooling time release pressure, valve lever on: “Pressure release”.

Open the clamping tools and remove the welded part.

Open the slide, valve lever on: „BACKWARDS“.
W e l d i n g i s c o m p l e t e d .
5.5 Welding angles
When angles have to be welded, the welding surface of the pipes and thus the necessary
pressure is changing.
The necessary pressure is calculated as follows:

Gather the prescribed value for adjusting or cooling pressure from the table.

Multiplicate the pressure value with factor 1/cos (angle).
This produces the following factors:
Welding 15° (Pipes chamfered for 7.5°): 1.01
Welding 22.5° (Pipes chamfered for 11.25°): 1.02

Add the movement pressure as usual.
The other welding parameters remain as noted in the table.
Angle