2) The loss of strength in HAZ of weld joints of work hardened Al alloys can be reduced by
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- What are some sources of hydrogen that can contaminate a weld?It has been reported that gas–tungsten arc welds of aluminum made in the overhead position (assumed lap weld joint) tend to have a significantly higher porosity level than those made in the flat position: a. Explain why b. Sketch the general view of the overhead position c. Indicate where the (most probable) location of the porosityWelding stainless steel is a complicated process because (uniform / intergranular / erosion) corrosion may happen, to avoid this issue post-weld-heat treatment is conducted to (precipitate / dissolve) carbide particles.
- HANDWRITTEN ANSWER PLS. What does liquid-solid phase bonding mean and in which cases is it preferred instead of welding? What does capillarity mean in this process?a) explain the principles of Gas Metal Arc Welding (GMAW) b) explain three (3) modes of metal transfer for GMAWwhy is arc shielding requried during arc welding ? how is the arc shielding accomplshed? provide the detailed explanation
- For a cross section of a typical fusion-welded joint: (a) list all types of different zones in the joint and (b) Explain the different types of grain structure that formed during welding of metal.What is metal inert gas welding and the effect of metal inert gas welding process parameters? Diagrams?what is ultrasonic welding? dicuss the mechanism of this process. what is the main limitaion of ultrasonic welding?
- Express the Melting Efficiency Only in Percentage. Two aluminium plates are welded using Tungsten Inert Gas (TIG) welding process with the help of welding current 150 A, arc voltage 12 V and arc travel speed 2 mm/s. Considering heat transfer efficiency of TIG welding process as 90% and heat required for melting unit volume of metal (Al) as 15 J/mm^3, Find out the Melting efficiency?It has been reported that gas–tungsten arc welds of aluminum made in the overhead position (assumed lap weld joint) tend to have a significantly higher porosity level than those made in the flat position: Explain why Sketch the general view of the overhead position Indicate where the (most probable) location of the porosityA GTAW operation is performed on low carbon steel, whose unit melting energy is 10.3 J/mm3. The welding voltage is 22 volts and the current is 135 amps. The heat transfer factor is 0.7 and the melting factor is 0.65. If filler metal wire of 3.5 mm diameter is added to the operation, the final weld bead is composed of 60% volume of filler and 40% volume base metal. If the travel speed in the operation is 5 mm/sec, determine (a) cross-sectional area of the weld bead, and (b) the feed rate (mm/sec) at which the filler wire must be supplied.