Basic Math For Welding And CWI Inspection Part 1

Explore the basic math used in welding and inspection to prepare for the CWI exam, with practical guidance for writing procedures and supporting field work.

Explore the essential math concepts applied to welding and CWI inspection, as covered in part 1 of the basic math for welding and CWI inspection course.

Learn to read a decimal number from the millions place to the millionths, identifying units and each decimal place from the left to the right, with inch measurements as examples.

Learn how to add fractions by converting to a common denominator using the least common denominator, convert to sixteenths, and add like fractions, while understanding fractions and decimals.

Convert fractions to decimals by dividing the numerator by the denominator, using practical examples from welding and CWI inspection contexts.

Convert inches in fractions to millimeters in decimal form using 25.4 mm per inch. Use 1/2 = 0.5 and 0.5 × 25.4 = 12.7 mm as examples.

Convert percentages to decimals by moving the decimal two places and calculate percent of numbers, such as 15% of 135. Learn to add or subtract percentages to a base.

Explain circle area using radius and diameter definitions, apply pi as 3.14, and compute area equals pi times radius squared with a 12-inch diameter example (radius 6 inches).

Calculate the maximum tensile strength of a diameter bar by using pi r^2 for the area and dividing the load by that area, shown with a 0.25 inch diameter.

Calculate the maximum tensile strength of a rectangular specimen by multiplying thickness and width to get area, then divide the load by the area to express the strength in psi.

Calculate the percentage elongation of a pulled specimen using (final - original) / original times 100, illustrated by a bar with original 2.0 and final 2.25, yielding 12.5%.

Calculate the percentage reduction of area by subtracting the final from the original area and dividing by the original area, shown with 2.6 inch square original and 2.5 inch square final.

Compute heat input for welding with the formula volts times amps times 60 divided by travel speed, yielding joules per inch.

Understand how to compute carbon equivalency using formula carbon plus magnesium divided by six, nickel divided by fifteen, chromium divided by five, copper divided by thirteen, milenium divided by four.

Explore quick views of welding processes, including SMAW and GMAW, and learn electrode identification, polarity, and common transfer modes, with notes on porosity and arc blow.

Identify welding processes FCAW and GTAW and understand AWS electrode classifications, shielding requirements, and the advantages of gas shielding versus self-shielded flux core for high-quality welds.

Explain the AWS D1.1 joint designation B-U4a, including prequalified welding processes, joint symbols, base metal thickness notation, and backing versus no backing in weld design.