АНГЛИЙСКИЙ ДЛЯ СВАРЩИКОВ

Man-machine Communication for Multi-run Arc Welding

The multi-run welding of heavy components imposes special demands on man-machine communication (MMC) for automated welding systems. Welding sequences of several hours with limited operator surveillance necessitate pre-programming, not only of the nominal process data, but also of other conditions for the successful performance of the welding process in varying external conditions. Warnings of conditions requiring the operator's attention must be given during welding. Should a situation occur in which the quality of the weld is jeopardized, the process must be stopped in a controlled manner and the reason for the stop must be displayed. Upon completion of the weld, a presentation, indicating all the important events during the welding cycle, should be made to determine the amount of non­destructive testing. Provision should be made for further detailed investigations of optional parts of the cycle, as well as for the storage and documentation of the course of the process.

The operator interface for the ESAB multi-run MMC is an industrial PC. The pre-programming modules are divided into blocks of set-up parameters, process parameters, warnings, reports and stop limits. Different sets of process parameters can be automatically retrieved during the welding sequence. During welding, the screen shows the preprogrammed parameters, the actual measured values and the way the process is progressing (e. g. layer, bead and position).

If a warning is activated, the operator is given the choice of immediately stopping the process stopping it after the completion of the bead or allowing it to continue.

A small remote control box, which can be hand-held, contains the controls the operator needs for preparing, starting and stopping the process. The control system registers the welding sequence in two separate files, the Weld Report and the multi-run. In the Weld Report, all the installation parameters such as wire type and wire dimension, flux (or gas) type and permissible inter-pass temperatures are stored, together with the specified
process parameters such as welding voltage, welding current and welding speeds and their report, alarm and stop link.

All the important events during welding, such as start, stop(s), restarts, exceeded report limits and warnings for flux level, high or low interpass temperature, are stored in the Weld Report. All the events are stored together with the actual date, time, weld layer, weld bead and position in the joint. Should the event be an exceeded process parameter, the parameters at the time in question are also stored.

In the Log File, the position and process parameters are continuously registered (every 20 mm). A normal Log File report for a thick-walled welding object could fill 1,000 pages.

The Weld Report provides a good overview of important events during welding. The reported events provide valuable information for the planning of non-destructive testing and offer easily-accessible documentation of the welding process. If further investigations are deemed necessary, the Weld Report constitutes a good register for entering the Log Files in which detailed information from the sectors associated with the reported events can be found.

The multi-run control system can also be connected to customers' central computer systems for documentation or further processing of both Weld Reports and Log Files, together with other quality control data.

After reading activity

Answer the following questions:

1. What are the functions of the described automated system?

2. In what cases must the welding process be automatically stopped?

3. What does the system do when the weld is completed?

4. What do the pre-programming modules include?

5. What parameters are displayed on the screen during the welding process?

6. What can an operator do when he receives a warning from the automated system?

7. What does the remote control unit contain?

8. Where are all the important events happening during the welding process stored?

9. What is registered in the log file?

Translate the following sentences into English:

1. Использование автоматизированных сварочных систем позволяет легко определить объем необходимого контроля качества.

2. В случае возникновения угрозы качеству сварного шва сварочный процесс немедленно прекращается.

3. Оператор может контролировать подготовку, начало и завершение сварочных операций с помощью пульта дистанционного управления.

4. Данные о дате, времени выполнения операции сварки, сварном слое, наплавленном валике сварного шва сохраняются в отдельном файле.

5. Автоматизированные сварочные системы не требуют значительного вмешательства оператора в ход сварочного процесса.

6. Информация о типе и диаметре сварочной проволоки заносится в программу.

7. По окончании сварки на дисплее отображается вся наиболее важная информация о ходе процесса сварки.

8. Записанные параметры представляют собой ценную информацию о процессе сварки.

9 Данные поступают в центральную вычислительную систему для дальнейшей обработки.

10. Автоматизированная сварочная система обеспечивает успешное осуществление сварочного процесса.

While-reading activity

Find the English equivalents in the text for the following words and word combinations:

производство, частый пользователь, растущий рыночный спрос, источник информации по сварке, выполнять простые вычисления, новейшие программные технологии, заметный прогресс в производстве аппаратного обеспечения, графическая система, набор правил, практический опыт, вопросы для контроля знаний, видеоряд, круглосуточно, богатый источник информационных технологий в области сварки, местный телефонный звонок, удобное средство связи, набор протоколов, гипертекстовая ссылка, каталог веб-страниц, поисковая машина, поиск технической информации, температура предварительного подогрева, иметь доступ к персональному компьютеру, обучающие программы, скорость обмена данными.