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HEAT BALANCE

HEAT BALANCE. Heat Balance. Lesson Objectives When you finish this lesson you will understand: Factors Effecting Heat Balance Solve Heat Balance Problems. Learning Activities View Slides; Read Notes, Listen to lecture Do on-line workbook.

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HEAT BALANCE

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  1. HEAT BALANCE

  2. Heat Balance • Lesson Objectives • When you finish this lesson you will understand: • Factors Effecting Heat Balance • Solve Heat Balance Problems • Learning Activities • View Slides; • Read Notes, • Listen to lecture • Do on-line workbook Keywords: Heat Generation, Heat Conductions, Electrode Geometry, Resistivity, Thermal Conductivity

  3. Factors Affecting Heat Balance • Relative electrical and thermal conductivities of the metals to be jointed • Relative geometry of the parts at the joint • Thermal and electrical conductivities of the electrodes • Geometry of the electrodes

  4. Heat Balance in Projection Welds Factors affecting uniform distribution of heat are : • Projection design and location. • Thickness of the section. • Thermal and electrical conductivities. • Heating rate. • Electrode alloy.

  5. Temperature Distribution Temperature distribution at various location during projection welding. At the end of welding time Electrode After 20% welding time Workpiece Electrode Temperature

  6. Heat Dissipation Water-Cooled Copper Alloy Electrode Water-Cooled Copper Alloy Electrode Base Metal Base Metal Weld Nugget

  7. Improving Heat Balance Methods for Spot Welding (a) (b)

  8. Improving Heat Balance Methods for Spot Welding High Conductivity Alloy High Conductivity Alloy High Resistance Electrode Low Conductivity Alloy Low Conductivity Alloy (a) (b) (c) (d)

  9. Questions

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