Part of Unit: Oxy-fuel Cutting and Welding
Lesson Plan Overview / Details
Upon the completion of this lesson, the student will know how to:
1. Fusion-weld mild steel with and without filler rod by using the oxy-fuel system.
2. Set the Oxy-acetylene torch to a proper neutral flame.
3. Identify the three types of flames produced from an oxy-acetylene outfit (carburizing, oxidizing and neutral)
- Instructional Time
- 2 Class Periods
- Lab Practical / Assignments
- 5 Class Periods
- Teacher Demonstrations
- 30 - 45 Minutes
California Career and Technical Education Standards
- ANR.B.B7.2 Know how to properly set up, adjust, shut down, and maintain an oxy-fuel system.
- ANR.B.B7.4 Know how to fusion-weld mild steel with and without filler rod by using oxy-fuel...
California Academic Content Standards (Reinforced)
- ELA.9-10.R.CAGT.2.6 Demonstrate use of sophisticated learning tools by following technical direction...2
Objectives and Goals
- Upon completion of this lesson the students will be able to run a bead with the oxyacetylene equipment with and without filler rod.
- Upon completion of this lesson the students will be able to set their oxy-acetylene torches at a proper neutral flame and be able to identify the differences between an carburizing, oxidizing and neutral flame .
Activities in this Lesson
- Oxy-Fuel Assignment Examples - Hooks / Set
As the students enter the classroom /shop, I wait for them to take their seats and take roll. In front of the classroom I have examples of numerous oxy-acetylene welds/assignments; Push a puddle (no filler rod added), bead with filler rod, fusion outside corner weld, butt weld, lap weld, Tee weld, and examples of brazing and cutting. I quickly pass the assignments / welds around the class and explain to them that these are the various assignments they will be performing over the next few weeks during the oxy-fuel unit. After some discussion and all welds are accounted for, I proceed into the lecture portion of the lesson and present the PPT title "Running a bead with and without filler rod" and hand out the student note packets (provided).
Power point presentation - running a bead with and without filler rod with student note packet for students to follow.
- Running beads without filler rod - Demo / Modeling
After all notes and lecture are complete proceed to the shop and demonstrate to the students what you expect within the welding assignments. Before the actual demonstration you need to properly set up the shop or welding area so students may get a clear view of the welding demonstration. Set a welding shop (metal) table in the center of the shop floor. Have a couple of firebricks, a piece of 14 gauge sheet metal- cut at 1 1/2" X 4", a friction lighter, the oxy-fuel outfit, welding gloves, slip joint pliers and shade #5 welding glasses or goggles ready on the welding table. As the students arrive in the shop have them each put on a pair of shade #5 welding goggles / glasses and review the start up procedures for the unit. Set the regulators at 5 lbs acetylene and 5-8 lbs oxygen, light the torch and obtain a neutral flame. Set the metal on top of the firebrick, put on all safety gear and proceed into the demonstration. The teacher should have several pieces of metal and show the students a good bead, one that you blew through due to traveling too slow, bead with an oxidizing flame, a bead with an carburizing flame, a bead with the travel speed to quick, a bead with the tip too close to the molten puddle, tip to far from the molten puddle, work angle too great and work angle to straight, ect... show the students how to properly grab hot metal with the pliers and safely dunk it into the dunk tank (with gloves on!) pass around (after cooled) the examples of each weld demonstrated and be sure they see the one that you ran correctly. Have some discussion, ask questions and check for understanding. Hand out the welding assignment sheet titled Push a Puddle, have the students read the assignment sheet and check for understanding. Then let them proceed into the assignment on their own.
- Running beads with filler rod. - Demo / Modeling
After the majority of the students have completed the push a puddle assignment to the instructors satisfaction, proceed into a class demonstration on how to properly run a bead with filler rod. Again set up a metal shop/welding table in the center of the shop.
- Assessment Types:
- Rubrics, Projects, Demonstrations, Observations,
Assignment #1- Running a bead with no filler rod (push a puddle)
Assignment #2- Running a bead with filler rod.
Both assignment sheets have detailed instructions on the basic operation, preparing the equipment and materials, procedures to follow, and a grading rubric.