Abstract
This research deals with influence of the heat treatment on welded joints using the shielded metal arc welding (SMAW) on three types of steel with different carbon ratios under constant conditions such as the thickness of metal 20 mm, welding current 120A , voltage 80V, Diameter 15 mm and angle 60 degree. Mechanical tests were carried out to include tensile, bending, micro hardness and microstructure testing. The results showed that the steel with a low carbon content has the highest value of hardness after performing heat treatment in the area of welding line 370 HV. Unlike the moderate carbon- steel, the value of hardness was higher in the 310HV, the tensile strength of steel decreased to 554Mpa when carrying out the heat treatment compared with steel containing higher carbon ratios 523MPa . In the other side improving toughness and impact strength for welded joints on which heat treatments have been conducted after the welding process , where highest impact value was obtained in the high carbon steel 214 J
Highlights
With the technological development in advanced industries such as oil, automotive, aviation, piping networks, metallic bridges and other important industries, the need for a high-quality welding splices has increased ]1[
The welding samples were examined for accurate readings of the whole weld joint starting from the welding metal, the heat-affected area, the base metal, and on the both welding sides, at a distance of (1mm) between reading and another of the three welded joints
A higher tensile value was obtained when a heat treatment was carried out due to spread of the carbon from the base metal to the welding area except the steel which has very low carbon ratios and improvement of toughness and this occurs due to the partial degradation of pearlite, This rise in tensile strength after hеаt treatment might have been due to the fact that stored residual stresses in the weldment are relieves]9[
Summary
With the technological development in advanced industries such as oil, automotive, aviation, piping networks, metallic bridges and other important industries, the need for a high-quality welding splices has increased ]1[. Many studies have shown that the welding joints are cracked when they are exposed to dynamic loads that start in the transition zones from the weld line to the Basic metal has been demonstrated through numerous tests conducted in the field of fatigue tests [2[. It is noticeable that whenever the values of transition angle increases between the welding line and the base metal, the values of extent withstand increases for spherical joints treated using this method. The grinding and rolling methods were used to make a smooth transition between the welding line and the base metal, and reduce the concentration of the remaining stresses in this region [5].In the welding process, a high temperature is generated to melt the welding metal, the conditional interface between the welding metal and the welding zone is called fusion limits ]6[
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