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34
sound indicated a defective weld. By 1931, the revised Boiler Code accepted
welded vessels judged safe by radiographic testing. By this time, magnetic
particle testing was used to detect surface cracks that had been missed
radiographic testing. By this time, magnetic particle testing was used to
detect surface cracks that had been missed by radiographic inspection. In his
history of the ASME Code, A. M. Greene, Jr., referred to the late 1920s and
early 1930s as "the great years." It was during this period that fusion welding
received widespread acceptance. Nowadays, thousands of individuals who
make their living in welding live and breathe the ASME Code every minute
of the working day.
In 1977, Leonard Zick, chairman of the main committee of the ASME
Code, said, "It's more than a code; the related groups make up a safety
system. Our main objective is to provide requirements for new construction
of pressure-related items that, when followed, will provide safety to those
who use them and those who might be affected by their use. "
Reading 3
16 You will read four texts about Welding's Vital Part in Major
American Historical Events. Before you read suggest your answers to the
following questions.
1. How can welding influence the history of a country?
2. In what fields of industry, in your opinion, is welding especially
important?
3. What modern machines and structures cannot be produced without
welding processes?
4. What welding process, arc or gas ones, has played a more important part in
developing new technologies?
17 Look through the texts and find out what the following figures relate to.
140 20 5171 2200 1945 525 531 2710 120 176,000
500,000 586,000 17,000 80 373 500 52 48,6
Model: 2200 - 2200 passengers were killed on the Mississippi River when
the steamboat Sultana blew up.
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