- -  AGRICULTURE CORE CURRICULUM - - 

(CLF2000) Advanced Core Cluster: AGRICULTURAL MECHANICS

 (CLF2250) Unit Title: OXYACETYLENE WELDING

___________________________________________________________________________ 
 (CLF2258) Topic: OXYACETYLENE CUTTING/WELDING     Time     Year(s) 
                   PROJECT                       3 Hours  1 / 2 / 3 / 4
___________________________________________________________________________
 
          Topic Objectives: Upon completion of this lesson, the students
                             will be able to:

          Learning Outcome #:

              (F-12) - Construct a simple project requiring cutting and
                       welding.

          Special Material and Equipment: 

                       Materials:

                       Three sheets of 3" X 9" 16 ga. steel, one sheet 4" X 
                       4" 16 ga. steel, flux, 3/64" steel welding rod, 
                       brazing rod

                       Equipment:

                       Oxyacetylene welding equipment, #2 welding tip,
                       cutting torch attachment, cutting tip, pliers, quench
                       bath, water, protective gear

          References: 

          Evaluation: Project Completion.

TOPIC PRESENTATION: Oxyacetylene Cutting/Welding Project

A. Project: Pencil Holder

B. Principles

   1. Oxyacetylene equipment setup and operation

   2. Tip selection

   3. Puddle formation and manipulation

   4. Cutting steel sheetmetal

   5. Fusion welding a corner joint with and without a filler rod

   6. Braze welding fillet joints

C. Procedure

   1. Mark out three 2" X 3" pieces from the 3" X 9" piece of sheetmetal
       with a soapstone and cut with cutting torch.

   2. Form puddles on 2" X 3" pieces and move them across the surfaces to 
       form decorative patterns.

   3. Lean two small pieces together at 60 degree angles; form puddles on
       adjacent edges and allow the puddles to merge; move the puddle along
       the edge to weld without a filler rod.

   4. Finish the prism with the third small piece using a filler rod to 
       fusion weld the two edges.

   5. Braze weld the prism to the 4" X 4" base sheet.

D. Diagram

                            2"
                      ________________ 
                     |\             /|
                     | \           / |
  Fusion weld       | \         / |
  with rod  ------> |  \       /  |
                     |   \     /   | <------- Fusion weld with rod
                  3" |    \   /    |
                     |     \ /     |
               ______|      \/      |_______
              |     |      |       |     |
              |     |      | <------------------ Fusion weld without rod
              |     |      |       |     |
              |      \     |      /      |
              |       \    |     /       |
          4" |        \   |    /        |
              |         \  |   / <--------------- Braze weld
              |          \ |  /          |
              |           \ | /           |
              |            \| /            |
              |             \/             |
              |                             |
              |______________________________|

                             4"



7/1/91 OLR/tf


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