| 摘要 |
The invention is concerned with a method of butt-welding two tubular parts (7, 9) each equipped with an identifying code (21, 23), using an automatically controlled electro-welding machine. A device for performing a welding program is associated with said machine, said program being implemented as a function of the data contained within the identification codes. The data are defined on the basis of a welding law or standard to be applied as a function of various values for parameters relating at least to the thickness and diameter (or cross section) of the part considered at its abutment end, to the temperatures, lengths of time and welding pressure to be employed so that it would be possible to butt-weld tube parts if the codes (21, 23) of the parts are recognised as being compatible per se. The method further comprises the steps of: trimming butted ends of said tubular parts (7, 9) and if compatibility of the codes has been recognised; inserting between said butted ends said heating element (5) previously brought to a specific heating temperature; bringing said parts (7, 9) into contact with the said heating element (5) for a determined period of time; withdrawing under control said heating element (5); bringing the two softened abutting ends of said tubular parts (7, 9) into contact at the predetermined welding pressure, with said pressure being maintained for a specified length of time; allowing said tubular parts (7, 9) to cool in order to achieve a weld. |
