Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
WELDED JOINTS
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineering and Production Technology
Department
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Types of butt joints
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Other types of welded joints.
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
BASIC WELD SYMBOLS
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Strength of Transverse Fillet Welded Joints
DR. IBRAHEEM SABRY
t = Throat thickness (BD), s = Leg or size of weld,= Thickness of plate, and l = Length of weld t = s × sin sin 45° 45° = 0.7 0.707 07 s Minimum area of the weld or throat area, A = Throat thickness ×Length of weld = t × l = 0.70 0.707 7s ×l If σt is the allowable tensile stress for the weld metal, then the tensile strength of the joint for single fillet weld,P = Throat area × Allowa Allowable ble tensil tensilee stres stresss = 0.707 0.707 s × l × σt and tensile strength of the joint for double fillet weld, P = 2 × 0.707 s × l × σt = 1.414 s × l × σt
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Strength of Parallel Fillet Welded Joints A = 0.707 s × l
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Exam Exampl plee 10.1 10.1.. A plate 100 mm wide and 10 mm thick is to be welded to anot anothe herr plat platee by means eans of doub double le para parall llel el fill fillet ets. s. The The plat plates es are are subj subjec ecte ted d to a static load of 80 kN. Find the length of weld if the permissible shear stress in the the weld eld does does not not exce exceed ed5 55 MPa. MPa.
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Long fillet weld subjected to torsion
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Special Cases of Fillet Welded Joints
Circular fillet weld subjected to torsion
Circular fillet weld subjected to t o bending moment
DR. IBRAHEEM SABRY
Circular fillet weld subjected to torsion.
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Example 2. A 50 mm diameter solid shaft is welded to a flat plate by 10 mm mm fillet weld as shown in Fig. Fig. 10.12. Find the maximum torque that the welded joint can sustain if the maximum shear stress intensity in the weld material is not to exceed 80 MPa.
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
Exa xamp mple le 10. 0.3 3. A plate 1 m long, 60 mm thick is welded to another plate at right angles to each other by 15 mm fillet weld, as shown in Fig. 10.13. Find the maximum torque that the welded joint can sustain if the permissible shear stress intensity in the weld material is not to exceed 80 MPa.
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
A rectangular steel plate is welded as a cantilever to a vertical column and supports a si ngle concentra ratted loa oad d P, as shown in Fig. 1. De Detterm rmiine the weld size if shear stress in the same is nott to exc no xcee eed d 14 140 0 MP MPaa.
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
DR. IBRAHEEM SABRY
Modern Academy Lecture 1 Joinin g Process, MNF421 , Manufacture Engineerin Engineering g and Production Production Technology Department
DR. IBRAHEEM SABRY
