Welding 141

1. Many components shown on metric prints can be fabricated from materials that are available in standard metric sizes.

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2. Metric prefixes are generally mixed in one expression.

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3. Surfaces of thin materials shown in section are always indicated by section lines.

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4. U.S. Customary linear dimensions may be given as whole numbers, fractions, and decimals.

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5. When converting an inch dimension not having a tolerance to a millimeter equivalent, the conversion is made to the same preciseness or better.

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6. Certain operations require a specific welding process, a particular type of electrode, or other information necessary to complete the weld.

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7. When a grooved joint is required on heavy structural shapes, it may be possible to provide for a groove without formal preparation of the joint members.

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8. A standard welding symbol and weld symbols have been developed by the American Welding Society (AWS).

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9. For sketching isometric circles, the same basic techniques are applied as for sketching a regular circle.

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10. To save drafting time and to reduce drafting costs, it is common practice to designate similar welds by additional (multiple) arrows, or by an indication placed in the tail of the symbol.

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