2.0 Welding and Philosopher idea

Welding

  Cast iron has a carbon content of 2% - 4%, to make it strong. During the casting the molten iron is poured into a mold and allowed to cool slowly. During and after welding, the casting must be allowed to cool slowly to avoid cracking.

  A critical temperature used in most cast iron is about 1450 degrees F and don’t hold the temperature for long period of time.

Welding Techniques with Preheat

Typical preheat temperatures are 500-1200 degrees F and heat the entire casting. Preheat the casting iron slowly and uniformly. Preheating reduces the cooling temperature of the welding area.

Low current is used to weld to reduce the  residual stress. After the welding, the part is allowed to cool slowly. Sometimes the casting is insulated with blanket or buried in dry sand, to allow it cool slowly thus preventing from cracking.

Welding Techniques without Preheat

Raise the casting temperature to 100 degrees F . Never heat the casting so hot until bare hand s are cannot be placed on it.

Make  1” long welds. After welding, peening  is important with this technique. The weld and casting are allowed to cool. Do not accelerate the rate of cooling with water or compressed air.

The Studding Method

This method is used to repair the major breaks in large casting. Drill and tap holes over the surfaces that have been  beveled to receive the repair weld metal. Screw steel studs into the threaded  holes, leaving 3/16” (5 mm) to ¼” (6 mm) of the stud above the surface. Weld the studs in place and cover the entire surface of the break with weld deposit. After a good deposit, the two sides of the crack can be welded together.

Reference:

The Lincoln Electric Company, 1999, Guidelines for Welding Cast Iron, Lincoln Electric, Accessed on 25 October 2016, url: http://www.lincolnelectric.com/en-us/support/welding-how-to/Pages/welding-cast-iron-detail.aspx

The Philosopher

The design of this sculpture has a shape of  human being which was described as philosopher by the lecturer. The idea philosopher born from the environment of college, students and lecturer where lecturer is described as someone important who bring the change in students’ life. According to Merriam-Webster dictionary, (1824), philosopher means a person who studies about knowledge, truth, the nature and meaning of life. He is also someone who seeks wisdom or enlightenment. Based on this definition, philosopher can fit well for both lecturers and students who continuously seeking knowledge and wisdom, henceforth growth and success from whatever knowledge they gained. This also shows the common characteristic or unity between the community in a studying environment.

  According to me, the philosopher is a great idea used in making a sculpture in a studying place. After making the foundation, it is better to coat the entire iron rods with another metal, to make it shiny and smooth.

Reference:

Meriem Webster, 1824, Philosopher, Meriem-webster.com, Accessed on 25 October 2016, ,url: http://www.merriam-webster.com/dictionary/philosopher