Porosity is defined as cavity-type discontinuities formed by gas entrapment during solidification. Strength, fracture toughness , ductility and fatigue are the significant metallurgical and mechanical properties that must be considered. So in regards to the below quote: The method of stud welding is known as the drawn-arc process and specialist equipment is required in the form of a heavy-duty rectifier and a purpose-made gun. A moment M w acting about the local weld axis, U w. Types of Joints - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - If you have any website suggestions or concerns, email welder [at] thecityedition [dot] com.
There are four basic joints used in arc welding:
Common terminology used in the weld area is illustrated above right. BS EN  prescribes the rules for the use of symbols to detail welded joints on drawings. In the modern world of structural steel, welding is the process of joining two steel pieces the base metal together by heating them to the point that molten filler material mixes with the base metal to form one continuous piece. Undercut is not normally a serious problem unless significant tensile stresses exist transverse to the joint. The overall time includes setting up equipment, cleaning and checking of the completed weld.
What is a Full Penetration Weld? - Definition from Corrosionpedia
In this basic text, we will use the following electrodes indicated in Table 5. By Stephan Date Porosity is often classified into types based on its shape and distribution within the weld. The edge of one of the pieces is given a concave treatment and the other is left square. The SCM Table SCM pages through presents that design parameters for the most common prequalified welds used for structural building connections. It's only in the root area that it gets a little grey. The groove weld is commonly used to make edge-to-edge joints, although it is also often used in corner joints, T joints, and joints between curved and flat pieces.
The horizontal line--called the reference line--is the anchor to which all the other welding symbols are tied. Careful attention has to be paid to what code your welding or inspecting to for this reason. Thank you for your comments. A component of the weld force T w acting parallel to the weld seam along the local weld axis, U w. Common terminology used in the weld area is illustrated above right.