Lesson Plan. Applying Metrics for Welding Welding

Transcription

1 Applying Metrics for Welding Welding Lesson Plan Performance Objective Upon completion of this assignment, the student will be able to demonstrate knowledge of the basic terminology of metrics. The student will be able to convert metric units and convert from US Customary to Metric (SI) units of length by completing the Applying Metrics to Welding Test. Specific Objectives Define the terms used in metrics List international units Convert metric units Convert from US Customary to Metric (SI) units Terms SI- Systems International; identifying abbreviation for metrics Ampere (symbol A )- Unit of electrical current Metric System- A decimal system of weights and measures based on the meter and on the kilogram Volume- The amount of space occupied by a three-dimensional object as measured in cubic units (as quarts or liters) o Formulas- (Rectangular Prism=side1 side2 side3)(cylinder= 3.14 X R2 X Height) Meter (symbol m )- The base unit of length in the International System of Units Mole (symbol mol )- The base unit of amount of pure substance in the International System of Units Base Unit- One of a set of simple units in a system of measurement that is based on an established standard and from which other units may be derived Capacity- A measure of content Kilogram (symbol kg )- Used to measure mass Candela (symbol cd )- Used to measure luminous intensity Mass- The property of a body that is a measure of its inertia Second (symbol s )- Used to measure time Kelvin (symbol K or C )- Used to measure temperature Area- The surface included within a set of lines Time It should take approximately 1.5 hours for this lesson. 1

2 Preparation TEKS Correlations This lesson, as published, correlates to the following TEKS. Any changes/alterations to the activities may result in the elimination of any or all of the TEKS listed. Welding (c) o (3) The student applies academic skills to the requirements of welding. The student is expected to: (A) demonstrate effective communication skills with individuals from varied cultures such as fellow workers, management, and customers; (B) demonstrate mathematical skills to estimate costs; (C) demonstrate technical writing skills related to work orders; (D) apply accurate readings of measuring devices, both U.S. customary and metric; (E) accurately use an appropriate tool to make measurements; (F) compute measurements such as area, surface area, volume, and perimeter; (G) determine how changes in dimension affect geometric figures; (I) use a calculator to perform computations; and (J) perform conversions between fractions and decimals. Interdisciplinary Correlations English Language Arts and Reading, English I (b) o (15) Writing/Expository and Procedural Texts. Students write expository and procedural or work-related texts to communicate ideas and information to specific audiences for specific purposes. Students are expected to: (B) write procedural or work-related documents (e.g., instructions, s, correspondence, memos, project plans) that include: (i) organized and accurately conveyed information; and (ii) reader-friendly formatting techniques. Mathematics (b) o (8) Measurement. The student solves application problems involving estimation and measurement of length, area, time, temperature, volume, weight, and angles. The student is expected to: (D) convert measures within the same measurement system (customary and metric) based on relationships between units. 2

3 Geometry (b) o Basic understandings. (1) Foundation concepts for high school mathematics. As presented in Grades K-8, the basic understandings of number, operation, and quantitative reasoning; patterns, relationships, and algebraic thinking; geometry; measurement; and probability and statistics are essential foundations for all work in high school mathematics. Students continue to build on this foundation as they expand their understanding through other mathematical experiences. Occupational Correlation (O*Net Job Title: Welders, Cutters, and Welder Fitters O*Net Number: Reported Job Titles: Aluminum Welder, Fabrication Welder, Fabricator, Fitter/Welder, Maintenance Welder, Mig Welder, Sub Arc Operator, Welder, Welder-Fitter, Welder/Fabricator Tasks Weld components in flat, vertical, or overhead positions. Operate safety equipment and use safe work habits. Lay out, position, align, and secure parts and assemblies prior to assembly, using straightedges, combination squares, calipers, and rulers. Examine workpieces for defects and measure workpieces with straightedges or templates to ensure conformance with specifications. Recognize, set up, and operate hand and power tools common to the welding trade, such as shielded metal arc and gas metal arc welding equipment. Weld separately or in combination, using aluminum, stainless steel, cast iron, and other alloys. Clamp, hold, tack-weld, heat-bend, grind or bolt component parts to obtain required configurations and positions for welding. Select and install torches, torch tips, filler rods, and flux, according to welding chart specifications or types and thicknesses of metals. Ignite torches or start power supplies and strike arcs by touching electrodes to metals being welded, completing electrical circuits. Connect and turn regulator valves to activate and adjust gas flow and pressure so that desired flames are obtained. Soft Skills Critical Thinking Operation and Control Monitoring Reading Comprehension 3

4 Accommodations for Learning Differences It is important that lessons accommodate the needs of every learner. These lessons may be modified to accommodate your students with learning differences by referring to the files found on the Special Populations page of this website. Preparation Materials o Prefixes chart- Refer to Slide 7 of slide presentation o Conversion chart- Refer to Slide 15 of slide presentation o 3 liter bottle of soda pop o Items from the classroom to measure Equipment o Computer and projector for slide presentation o Metric ruler for each student Learner o Prior mastery of standard linear measurement References Bennett, A. E., & Siy, L. J. (1999). Blueprint reading for welders. Independence, KY: Cengage Learning. Fortney, C., & Gregory, M. (1984). Introduction to welding: Student material. Stillwater, OK: Mid- America Vocational Curriculum Consortium. Marion, N. (2013). Math for welders. (5 th edition) Tinley Park, IL: Goodheart-Willcox. Instructional Aids Applying Metrics for Welding slide presentation and notes Metric Conversions Handout Applying Metrics to Welding Worksheet and answer key Applying Metrics to Welding Test and answer key Introduction The objective of this lesson is to introduce students to the Metric (SI) system of measurement. Show o Use a 3 liter bottle of soda as an example of how we use metrics in the U.S. today (as opposed to the way the rest of the world uses metrics). Ask o What are other items we use every day that are measured with the Metric (SI) system? Ask o How is a bottle s volume measured? How much liquid is in the bottle? o How do you measure the volume of liquid in a bottle? 4

5 Say Write a list of 10 items we determined we use every day. Use the questioning to engage students in conversation about the U.S. and the rest of the world s use of metrics. Discuss the variety of student responses. 5

6 Outline MI I. Introduction II. III. IV. OUTLINE Slide presentation and discussion A. Metrics defined B. International identification C. Powers of 10 D. SI base units of measure I. Meter- "m" II. Kilogram- "kg" III. Second- "s" IV. Ampere- "A" V. Kelvin- "K" or "C" VI. Mole- "mol" VII. Candela "cd" E. Units of length F. Converting metric units G. Converting metric to US customary units Guided practice desk measurement A. Students measure their desk/table tops with a metric ruler Independent practice measurement A. Students choose (individually or with an assigned partner)and measure designated objects in the shop/classroom B. Students should write down results C. Teams should switch results with another team and check the team s work by measuring the opposing team s object D. Students complete the Applying Metrics to Welding Worksheet V. Review NOTES TO TEACHER Prior to the lesson, choose several items to be measured for the independent practice portion of lesson. The objective of this lesson is to introduce students to the Metric (SI) system of measurement. Review and show Applying Metrics for Welding slide presentation. Teacher should become familiar with conversions. Distribute and discuss the Metric Conversions Handout. Distribute the Applying Metrics to Welding Worksheet and have students complete after lesson presentation. Distribute and administer the Applying Metrics to Welding Test. Grade with key. VI. Applying Metrics to Welding Test at the end of lesson three. 6

7 Multiple Intelligences Guide Existentialist Interpersonal Intrapersonal Kinesthetic/ Bodily Logical/ Mathematical Musical/Rhythmic Naturalist Verbal/Linguistic Visual/Spatial Application Guided Practice The teacher will guide students as they practice measuring their desk/table top with a metric ruler. Independent Practice Have students choose (individually or with an assigned partner) and measure designated objects in the shop/classroom. Students should write down results. Teams should switch results with another team and check the team s work by measuring the opposing team s object. Students complete the Applying Metrics to Welding Worksheet individually. Summary Review Review the material orally by asking specific conversion questions to individual students. Encourage responses by rewarding correct answers with praise and incorrect answers with positive reinforcement and redirection. Evaluation Informal Assessment Teacher will observe and check as students are measuring designated objects. Formal Assessment Students complete Applying Metrics to Welding Test at the end of the lesson on metrics. Enrichment Extension Use of metrics will be applied in future shop experiences and in the work place. 7

8 Metric Conversions Handout Kilometer = 1000 Decimeter = 0.1 Hectometer = 100 Centimeter = 0.01 Decameter = 10 Millimeter = Meter = 1 (Base Unit) Converting Metric Units The conversion of units in the Metric (SI) system of measurement is easy when using the diagram above to help. To increase the conversion, you must divide by the number of spaces between measurements. For example, convert 1492 m to km = km. From meters to kilometers it is Step 1 m to dam = 10 Step 2 dam to hm = 100 Step 3 hm to km = 1000 Answer 1492 m / 1000 = km To decrease the conversion, you must multiply by the number of spaces between measurements. For example, convert 4.9 hm to dm = 4900 dm. From hectometers to decimeters it is Step 1 hm to dam = 10 Step 2 dam to m = 100 Step 3 m to dm = 1000 Answer 4.9 hm X 1000 = 4900 dm Converting Metric to US Customary Units As a welder, you will be required to convert mm to in and in to mm. For the purposes of welding, most conversions can be rounded up for simplicity. The highest tolerance a welder may be required to use is 1/64. Converting in to mm, round to the nearest mm Converting mm to in, round to the nearest.1 in. When converting from in to mm, you must multiply the in by Example in to mm in X 25.4 = mm Round to 86 mm When converting from mm to in, you must divide the mm by Example mm to in mm / 25.4 = in Round to 1.3 in 8

9 Name Date Class Applying Metrics to Welding Worksheet 1) What is the metric equivalent conversion for the following? A. Thousandths B. Tenths C. Hundreds 2) Using a metric ruler, measure this test paper and provide the dimensions in millimeters. Length = mm Width = mm Convert the following measurements 3) 6.5 hectometers to decimeters 4) 1974 millimeters to dekameters 5) 8.9 kilometers to meters 6) 1982 centimeters to kilometers 7) 20 decameters to kilometers 8) 3 meters to centimeters Convert the following measurements (DON T FORGET TO ROUND) 9).875 inch to millimeters 10) 30 millimeters to inches 11) 20 centimeters to inches 12).25 inch to millimeters 13) 5/8 inch to millimeters 14) 60 millimeters to inches 15) 6.5 inches to millimeters 16) 25 feet to meters 9

10 Applying Metrics to Welding Worksheet Answer Key 1) What is the metric equivalent conversion for the following? A. Thousandths millimeter B. Tenths decimeter C. Hundreds hectometer 2) Using a metric ruler, measure this test paper and provide the dimensions in millimeters. Length = mm Width = mm Convert the following measurements 3) 6.5 hectometers to decimeters 4) 1974 millimeters to dekameters 6500 dm.1974 dam 5) 8.9 kilometers to meters 6) 1982 centimeters to hectometers 8900 m hm 7) 20 dekameters to kilometers 8) 3 meters to centimeters.2 km 300 cm Convert the following measurements: (Don t forget to round) 9).875 inch to millimeters 10) 30 millimeters to inches 22.2 mm 1.2 in 11) 20 centimeters to inches 12).25 inch to millimeters 7.9 in 6.4 mm 13) 5/8 inch to millimeters 14) 60 millimeters to inches 15.9 mm 2.4 in 15) 6.5 inch to millimeters 16) 25 feet to meters mm 8.3 m 10

11 Name Date Class Applying Metrics to Welding Test 1. For the following terms, select those metric expressions that are presented incorrectly and revise them so they are correct. If correct, leave blank. A. 4 ¾ mm B mm C Mm D. 16 ½ mms. E. 12,750 mm F. 0.7 millimeters 2. What is the metric equivalent conversion for the following? A. Thousandths B. Tenths C. Hundreds 3. Fill in the missing information. Quantity Name Symbol Length Mass Time Electric current Temperature Amount of substance Luminous intensity 4. Convert the following to metric values. A. 9/16 in mm B. 7/8 in mm C in mm D in mm 5. Using a metric ruler, measure this test paper and provide the dimensions in millimeters. Length = mm Width = mm 11

12 Applying Metrics to Welding Test Answer Key 1. For the following terms, select those metric expressions that are presented incorrectly and revise them so they are correct. If correct, leave blank. A. 4 ¾ mm 4.75 mm B mm.10 mm C Mm mm D. 16 ½ mms mm E. 12,750 mm mm F. 0.7 millimeters 0.7 mm 2. What is the metric equivalent conversion for the following? A. Thousandths millimeter B. Tenths decimeter C. Hundreds hectometer 3. Fill in the missing information. Quantity Name Symbol Length meter m Mass kilogram kg Time second s Electric current ampere A Temperature Kelvin (Celsius) K(C) Amount of substance mole m Luminous intensity candela cd 4. Convert the following to metric values. A. 9/16 in mm B. 7/8 in mm C in mm D in mm 5. Using a metric ruler, measure this test paper and provide the dimensions in Millimeters. Length = mm Width = mm 12