![]() It is a process whereby the edges of the plate are brought together and arc welded using a consumable electrode and flux. SAW was first performed on line pipe in 1930. ![]() This reduces the inductive voltage drop, assists the fast zero transitions and avoids the unnecessary creation of magnetic fields around the cables.īrad James, Alexander Hudgins, in Handbook of Materials Failure Analysis with Case Studies from the Oil and Gas Industry, 2016 3.5 Submerged-Arc Weld Defects If the welding cables are long, it is a good idea to run the supply and return cables close together. This is a relatively simple and satisfactory way of controlling single-phase AC without interrupting the welding current and extinguishing the arc. One type of AC welding current power source produces a square wave. Power sources for submerged arc welding are designed for high current and duty cycles, e.g. This method can be suitable for use with thick wires and in combination with power units having a drooping characteristic, in order to reduce current variations. The wire feed speed is sometimes also controlled by sensing the arc voltage and adjusting the wire feed speed to maintain a constant arc length. A straight characteristic provides good self-regulation of the arc length. ![]() Power sources for submerged arc welding may have either straight or drooping characteristics. Refrigerate for up to 1 week.Klas Weman, in Welding Processes Handbook (Second Edition), 2012 Power sources Transfer the pesto to a wide-mouth jar, cover the surface with a little olive oil, and cover with a lid. If the pesto is not loose enough to be spooned, add water, 1 tablespoon at a time, until it is the consistency of thick puree.Ħ. Add the cheese and pulse until it is thoroughly blended. Continue working the pesto until it is pureed, scraping down the bowl with a spatula when necessary.ĥ. With the motor running, add the oil through the feed tube in a very thin, steady stream. Work the mixture until it is finely chopped.Ĥ. Add the watercress and mint leaves, lemon rind and lemon juice, and a generous pinch of salt. In a food processor, grind the almonds and garlic. With your hands, squeeze out the excess water.ģ. Count to 10, then use tongs to transfer them to the ice water. Add the watercress and mint leaves to the boiling water, pushing them down to submerge them completely. Fill a bowl with ice water and set it next to the burner.Ģ. Bring a medium saucepan of salted water to a boil. Small handful fresh mint leaves (1/2 cup packed)Ĭup freshly grated hard cheese, such as Parmesan, Asiago, or Pecorino Romanoġ. It adds an exciting element wherever it goes. Keep a jar of pesto handy to toss with pasta, drizzle over grilled fish or anything else fresh off the grill, spread on crostini for a snack, stir into soup, or replace mayo in a sandwich. You can buy the almonds or roast them yourself in a 350-degree oven for 8 to 10 minutes until fragrant. They're blended with lemon rind and juice, olive oil, a grated hard cheese such as Parmesan, and roasted unsalted almonds. A handful of mint in the mixture adds a cooling counterpoint. To turn it into pesto, blanch the leaves for a few seconds in boiling water, then plunge them into a bowl of ice water. Most watercress in our markets has traveled too long and far to be extremely pungent, but it does have a fresh, peppery taste. The Latin name for watercress translates as "nose twister" because the freshly cut leaves activate a nerve that tingles much like it does when you eat wasabi. Basil will have to wait its turn until later in the season. Fiery, vitamin-rich watercress shines in this early summer pesto.
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