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  • Cutting and Weld Preparation; The Many Faces of Plasma Cutting (.pdf)
    Plasma cutting is a thermal cutting process in which a beam of ionized gas heats an electrically conductive metal beyond its melting point and flushes molten metal through the kerf of the cut. The electrical arc is produced between the electrode (negative potential) in the torch and the workpiece
  • The Importance of Squeeze Time in Resistance Welding (.pdf)
    Controlling the electrode force is a critical part of successful resistance welding. Repeatable weld force provides for consistent welds. For this reason, all Unitek Peco weld heads include a standard force-firing feature that initiates the power supply when a preset electrode force is reached
  • The Importance of Force Control (.pdf)
    There are many variables associated with the resistance welding process. The three primary variables are weld current, weld time, and electrode force. Secondary variables include, but are not limited to: electrode materials, electrode face size, polarity, material quality, and material composition
  • Stick Welding
    Stick, the most basic of welding processes, offers the easiest option for joining steel and other metals. Stick welding power sources deliver inexpensive options for welding versatility, portability and reliability. Stick joins metals when an arc is struck between the electrode and the work piece
  • TIG Welding
    Often called TIG welding (Tungsten Inert Gas), this welding process joins metals by heating them with a tungsten electrode which should not become part of the completed weld. Filler metal is sometimes used and argon inert gas or inert gas mixtures are used for shielding. Consumables: tungsten
  • Welding
    as to the materials that can be joined. Diffusion welding is employed primarily to join high-strength materials. In arc welding, an arc between an electrode and the workpiece generates heat. Shielding the molten weld metal from the atmosphere with gases fed in or generated by the weld reaction
  • The Benefits of Closed-Loop Control for the Resistance Welding Process (.pdf)
    welding principles. At the beginning of a resistance weld there is high electrical resistance at the electrode-to-part and part-to-part contact areas (Figure 1). If too much energy is applied before the electrodes have a chance to seat properly, these contact areas can overheat, resulting
  • MIG Welding Guide
    IG Welding (GMAW or Gas Metal Arc Welding) — An arc welding process which joins metals by heating them with an arc. The arc is between a continuously fed filler metal (consumable) electrode and the workpiece. Externally supplied gas or gas mixtures provide shielding. Common MIG welding is also
  • Using the Resistance Set Feature (.pdf)
    , can be used to consistently reduce contact resistance prior to the application of the welding current. In the first stage of a resistance weld, heat is focused at the electrode-to-part and part-to-part contact areas. This is due to the high contact resistance relative to the bulk resistance
  • Arc-Welded Studs
    , the heat for end welding the studs is from motor-generator or transformer-rectifier supplied dc current passing through an arc from the stud (electrode) to the plate (work). Weld cycle depends on stud diameter and may vary from 0.1 to 1 sec. A high-strength bond is obtained because the full cross-sectional
  • Sensor Sense: Piezoelectric Force Sensors
    and is used to determine the sensor's lowest frequency response. In a typical quartz-based force sensor, a charge-collection electrode is sandwiched between two quartz-crystal elements. The quartz elements are oriented to supply the same polarity voltage to the electrode when compressed, while the opposite