Упражнения

Упр.1. Найдите в тексте английские эквиваленты следующих слов и словосочетаний:

1.Значимые для общей прочности; 2. аттестованный сварщик; 3. осуществлять контроль сварочных работ; 4. повторное квалификационное испытание; 5. конкретное соединение; 6. выполняться вручную; 7. автоматическая подача проволоки; 8. наружный осмотр; 9. наладка, программирование и эксплуатация; 10. сварные узлы.

Упр.2. Переведите на английский язык следующие слова и словосочетания:

1. Subcontractor; 2. under daily supervision; 3. qualification test; 4. joint design; 5. tentative; 6. test piece; 7. penetrant testing; 8. blowpipe; 9. records of proficiency; 10. adequate regular training.

Unit 45. WELDING PROCEDURE SPECIFICATIONS

IN SHIP BUILDING

This section specifies requirements for welding procedure specifications and welding procedure qualification tests for C-Mn and low alloy steels, aluminum, austenitic stainless steel and ferritic-austenitic (duplex) stainless steels. C-Mn and low alloy steels are in this context referred to as “steels”. Welding may be performed with the following processes:

• manual metal arc welding ( metal arc welding with covered electrode)

• self-shielded tubular –cored arc welding

• submerged arc welding with one wire electrode (SAW)

• submerged arc welding with strip electrode

• metal active gas welding (MAG)

• tubular-cored metal arc welding with active gas shield

• tubular-cored metal arc welding with inert gas shield

• tungsten inert gas arc welding (TIG)

• plasma arc welding

A welding procedure specification shall contain as a minimum the following information relevant for welding operations:

- material: standard, grade and modification

- nominal thickness or diameter range (dimensions)

- welding process

- joint or groove designs with tolerances

- welding position(s) and direction of progression

- welding consumables, trade name, electrode or wire diameter, shielding

gas, flux and recognized classification

• welding sequence: number and order of passes or layers

• electrical parameters: voltage range, current range, polarity

• travel speed and heat input ranges

• preheat temperatures

• post weld heat treatment parameters

• details of cleaning processes employed and restrictions, if any.

The welding procedure specification is compiled on the basis of other approved welding procedures. For the following types of services the approval of welding procedure specifications is necessary:

• butt welds used in cargo tanks, process pressure vessels, and\or piping systems for liquefied gases;

• all welds in aluminum;

• butt welds and essential fillet welds used in cargo tanks;

• hull structure, process pressure vessels and \or piping systems in ferritic-austenitic stainless steels;

• butt welds in plate thickness above 50 mm;

• butt welds in material grade E and F single-side butt welds with and without backing in the vertical down position, welded connections between castings\ forgings and rolled material, such as stern frames, rudder, welding of highly stressed butt welds and cruciform joints located at large hatch openings;

• when welding consumables are not the type approved.

When a welding procedure qualification test is required, the tests must be performed in the environment applicable to the actual production and meet the specified minimum requirements.

VOCABULARY

Self-shielded –без дополнительной газовой защиты

Tubular-cored arc welding – сварка трубчатой порошковой проволокой

Strip electrode – ленточный электрод

Heat input – погонная энергия

Process pressure vessel – сосуд под давлением

Cruciform - крестообразный

C-Mn steel – углеродисто-марганцевая сталь

Nominal thickness – условная толщина

Groove – паз, выемка

Vertical down position – положение вертикальной сварки сверху вниз

Rolled material - прокат

Hatch – люк