3) The dihedral wetting angle between solid-liquid interface with lowest solidificationcracking tendency under identical weldingconditions is0°O45°60°90°

The angle for the solidification is 600

Answered: 3) The dihedral wetting angle between…

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter27: Weldability Of Metals

Section: Chapter Questions

Problem 19R: What problems can occur to stainless steel as it is allowed to form carbide precipitation during...

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In welding of metals, molten metal is deposited between the two objects that are to be welded together. Most of the heat from the molten material is conducted into the area around the weld, significantly increasing the temperature in the area, which can affect the local material properties. This area is often called the Heat Affected Zone (HAZ). Assuming you have base metal that is hypereutectoid steel, with a Cementite+Fine Pearlite microstructure, estimate what the microstructure would be in Area 1 and Area 2 of the HAZ. What is the primary factor (other than temperature and composition) that would affect what type of microstructure would be created?
Welding 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.
Q4 (a) Discuss the differences between fusion and solid state welding.
A fas tungsten arc welding operation is performed using a current 300 A and arc voltage of 25 V at a welding speed 10 mm/s. Assuming that the arc efficiency is 60%. Determine the net heat input per unit length of the weld.
Identify the defects and remedial actions in welding and casting process. Moreover, how rolling and forging defects can be removed effectively?
Q12. What the difference between the solidification of pure metals and impure metals alloys?
5 An inexperienced welder has welded a structural beam together and cooled it rapidly under water. This has caused the grain structure to become brittle. The beam will be used in the construction of a building. Which heat treatment method would be best to make the weld suitable for its purpose? (A) Heat the weld to 700 degrees Celsius and allow to cool slowly. (B) Heat to around 600-650 and hold for an hour then allow to cool slowly. (C) Heating to 300 degrees Celsius and let cool. (D) Reheat the weld to below the austenitic range and quench under water.
List five advantages of the modulated current andpulsed-arc metal transfer process.
8) The correct ways to control liquation cracking tendency in fusion weld joint are I. Use of filler metal that solidifies before the partially melted zone I. Use of single pass welding with higher net heat input instead of multipass welding III. Use of high energy density processes IV. Preheating the substrates V. Use of base metals with fine grain structure OI, II, and III II, and IV OII, IV, and V O II, III and IV
Resistance spot welding is performed on two plates of 1.5 mm thickness with 6 mm diameter electrode, using 15000 A current for a time duration of 0.25 seconds. Assuming the interface resistance to be 0.00010, the heat generated ( W-sec) to form the weld is
Your boss requests a recommendation on which process to use to weld the high strength structural steel rail tank cars hull section. You have this additional information: P-GMAW Productivity is substantially lower. However, you have welders already qualified to do manual p-GMAW welding. Labor is 80% of total cost HYPERFILLⓇ® Productivity gains are important, and the volume of the product is sufficient on the rail tank cars to justify capital investment. With confidence, you respond: Use process because .(Give process and short explanation for why you want to use that process)
What problems can occur to stainless steel as it is allowed to form carbide precipitation during welding?

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