1.1 d- stud stud diameter, dk - stud bolt diameter, d1- weld diameter welded h- height, k a stud bolt height, r- chamfer radius peg specifications: Φ8, Φ10, Φ13, Φ16, Φ19, Φ22, Φ25, Φ28 8 species most commonly used for the four kinds of intermediate. Peg peg shape See Figure 1.2, the timing arc stud welding process welding process sequence is: short circuit - lifting arc welding - off nail - electric upsetting - welding end