TENSILE STRENGTH AND HARDNESS WELDING JOINTS STEEL ST 37 USING VARIATIONS ELECTRODES

SKRIPSI

Abstract

By : DEDDY HERMANTO

Email : herman_wd_642@yahoo.com

Faculties : Fakultas Teknik

Department : S1 Teknik Mesin

Definition of welding according to DIN (Deutsche Industrie Normen) is a metallurgical bond at the junction of the metal or metal alloy that is carried out in the molten or liquid state. In other words, the weld is the local connection of several metal rods by using heat energy. In this connection process is sometimes accompanied by pressure and additional material (filler material). This experiment is tensile test and hardness vickers. Electrodes used type E 6013 and E 7016, a distance of 2 mm weld filler metal with an angle of 60. The welding process in ST 37 material with a horizontal position and a constant current of 120 A. As an evaluation of welded joints used Non Destructive Testing (NDT), NDT is used NDT Radiography and Ultrasonic. On the type of electrode E 6013 value higher tensile strength with its strength values are ?u = 38.166 kg /mm2 while for the type of electrode E 7016 the value of its strength ?u = 37.514 kg / mm2 tensile strength increment of 0.652 kg / mm2. Vickers hardness value of the graph in base metal and HAZ same that VHN average = 1.9 for each weld joints on the type of electrode E 6013 and E 7016. vickers hardness value in the weld metal has the greatest value, for this type of electrode E 6013 is VHN mean = 2.2, while for the type of electrode E 7016 is VHN average = 2.3. For the evaluation of welds using NDT shows that in NDT radiography showed defects that occur in the material. While the NDT ultrasonic does not indicate defects that occur due to defects in the radiographic NDT is still included in the standard. Metallographic test results in the fracture test specimens showed ferrite material and the tensile test specimens fracture showed ductile fracture.

Keyword : Welding, tensile strength, hardness, NDT, defects

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