Table of Contents
- 1 What are two functions of dimensions in welding?
- 2 What purpose do extension lines serve?
- 3 What is a dimension line?
- 4 What is the thickness of extension line?
- 5 What is wrong statement about dimensions?
- 6 What does typical mean in welding?
- 7 How is the precision of the measurements determined?
- 8 What is the difference between precision and accuracy?
What are two functions of dimensions in welding?
Dimensions help in knowing the size of the object. The examples of dimensions are length, breadth, and height. Generally, it is preferred to show dimensions in decimals. But the dimensions for weld fabrications are shown in decimals whereas, in drawings for machining operations we use decimal fraction.
What purpose do extension lines serve?
Extension lines continue or extend from the surface of the object and establish the size of the dimension. They do not touch the object lines and extend slightly past the dimension line. Extension lines provide a means of displaying a measurement without placing the dimension on the part.
What is dimension in welding?
The standard dimensions of the fillet weld are size, length, and pitch. Dimensions are required to be on the same side of the reference line as the fillet weld symbol — Figs. 7, 8. Figure 9 is an example of a dimension incorrectly specified.
How are the dimensions for a fillet weld given?
Fillet welds may have a size associated with them. This size is called out on the left side of the symbol before the vertical side. The size is indicating the leg length of the weld. If a single size is called out this is specifying that weld should have equal leg sizes.
What is a dimension line?
The dimension line is a fine, dark, solid line with arrowheads on each end. It indicates direction and extent of a dimension. In machine sketches and drawings, in which fractions and decimals are used for dimensions, the dimension line is usually broken near the middle to provide open space for the dimension numerals.
What is the thickness of extension line?
Explanation: Out lines, dotted lines and cutting plane-lines are drawn using 2mm thickness lines. Whereas centre lines, section lines, dimension lines, extension lines, construction lines, leader lines, short break lines and long-break lines are drawn using 1mm thickness lines.
How do you read weld dimensions?
The leg size is written to the left of the weld symbol. If the two legs of the weld are to be the same size, only one dimension is given; if the weld is to have unequal legs (much less common than the equal-legged weld), both dimensions are given and there is an indication on the drawing as to which leg is longer.
What is the purpose of dimension?
The purpose of dimensioning is to provide a clear and complete description of an object. A complete set of dimensions will permit only one interpretation needed to construct the part. Dimensioning should follow these guidelines.
What is wrong statement about dimensions?
3. Which is the wrong statement regarding dimensions? Explanation: There is no such rule that the dimensions should be placed only on left side of drawing because it may not possible to represent every dimension only on left side.
What does typical mean in welding?
The “TYPICAL” designation is intended as an alternative to repeating identical welding symbols many times on the same drawing, but only when the joints represented are identical in all details.
How do you describe dimensions?
Dimensions in mathematics are the measure of the size or distance of an object or region or space in one direction. In simpler terms, it is the measurement of the length, width, and height of anything.
What does precision mean in terms of mean and standard deviation?
Precision is usually expressed in terms of the deviation of a set of results from the arithmetic mean of the set (mean and standard deviation to be discussed later in this section). The student of analytical chemistry is taught – correctly – that good precision does not mean good accuracy.
How is the precision of the measurements determined?
The precision of the measurements refers to the spread of the measured values. One way to analyze the precision of the measurements would be to determine the range, or difference, between the lowest and the highest measured values. In that case, the lowest value was 10.9 in. and the highest value was 11.2 in.
What is the difference between precision and accuracy?
Accuracy of a measured value refers to how close a measurement is to the correct value. The uncertainty in a measurement is an estimate of the amount by which the measurement result may differ from this value. Precision of measured values refers to how close the agreement is between repeated measurements.
How are significant figures related to precision and precision?
Significant figures express the precision of a measuring tool. When multiplying or dividing measured values, the final answer can contain only as many significant figures as the least precise value. When adding or subtracting measured values, the final answer cannot contain more decimal places than the least precise value.