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Structural Steel Design (WELDED CONNECTION)
- 1. STRUCTURAL STEEL DESIGN CHAPTER1 WELDED CONNECTIONS I Department of Civil Engineering, University of North Sumatera Ir. DANIEL RUMBI TERUNA, MT;IP-U HAKI
- 2. Table of contents Introduction Examplesof welded connections Advantages of welding Welding process Welding inspection Type of welding Welding symbols Groove and fillet welds Slot and back welds
- 3. WELDED CONNECTIONS Introduction Welding isthe process of joining metal parts by fusing them and filling in with molten metal from the electrode. Welding has developed into an established and essential tool of the steel construction industry. Before welding was possible, rivets were used to create structural members and connect them. Today, welding is used to construct members such as plate girders and box sections, as well as to connect structural members together reliably and cost effectively. Along with the contributions of high- strength bolts, welding has rendered riveting obsolete.
- 4. WELDED CONNECTIONS Examples weldedconnections
- 5. WELDED CONNECTIONS Combination ofwelded and bolted connections
- 6. WELDED CONNECTIONS Economic: save gusset and splice plates Applicability : such as connection of steel pipe column Rigidity & Continuity : strong joint makes one-pieces Construction Easier to make changes during construction Relative silence Advantages of welds
- 7. Welds alsohave some disadvantages which may preclude their use, including: • Welds are brittle, not ductile like bolted connections • Very labor intensive • Skilled labor required • Quality control is difficult to inspect • Potential fire hazard in areas of welding
- 8. WELDED CONNECTIONS Welding process Electricarc produces 3600C between section to be welded and the electrode. Filler and Base metal are melt in a weld pool and join into one homogeneous solid Arc is shielded by slag to protect molten metal from air
- 9. WELDED CONNECTIONS Welding inspection 1.Visual inspection 2. Liquid penetrants 3. Magnetic particles 4. Ultrasonic testing 5. Radiographic procedures
- 10. Distortion of Welding IntialFinal WELDED CONNECTIONS
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- 12. WELDED CONNECTIONS Typical usesof fillet Welds
- 13. WELDED CONNECTIONS Typical usesof fillet Welds Build up section
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- 15. WELDED CONNECTIONS Examples oflapped joints Ease of fitting : pieces don’t required precise fabrication. pieces can be slightly shifted for adjustment Ease of joining : edge of pieces don’t need special preparation and are usually sheared or flame cut.
- 16. WELDED CONNECTIONS - Forlap joints, corner joints and T joints - Triangular in cross-section Transverse Transverse fillet weld Longitudinal fillet weld
- 17. WELDED CONNECTIONS Examples offillet welds
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- 19. WELDED CONNECTIONS - Commonlyused to make edge-to-edge joints Reasons for having reinforcement: (a) To take care of pits and other irregularities (b) Too difficult to make weld surface equal to material
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- 21. WELDED CONNECTIONS If thedepth of the V is not the full thickness--or half the thickness in the case of a double V--the depth is given to the left of the weld symbol.
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- 25. WELDED CONNECTIONS - Usedto join overlapping members, one of which has holes in it. - Weld metal is deposited in the holes and penetrates and fuses with the base metal. Section through plug Section through plug