The frequently utilized welding procedure for Stainless Steel

Stainless steel bonded pipeline calls for deep infiltration, no oxide inclusion and also small warm affected zone, the weld joints greatly influences the formability of stainless-steel pipe. The most typical welding technique for stainless steel is hand welding (MMA), followed by metal electrode gas welding (MIG/MAG) and also tungsten inert gas welding (TIG).

hands-on welding( MMA).

Manual welding is a really typical and easy-operate welding technique, can be utilized to weld almost all products and also any type of atmosphere also under water. In electrode welding, the length of the arc is changed by hand, which is established by the size of the void between the electrode and the work surface. For the most part, the welding is conducted by direct current, and also the electrode is used as both arc carrier and weld filler product. The electrode is made up of alloy or non-alloy metal core cable and electrode cover. This layer of finish to protect the welding seam from air damage, at the same time can maintain the arc, the electrode can be titanium type electrode, but also basic, which depends upon the thickness as well as make-up of the coating.


This is an automated gas protected arc welding technique. The arc is warmed in between the cable of the present provider and the work surface under the protecting gas, and the cord fed by the machine melts under its own arc as the electrode. Due to its versatility as well as numerous advantages, MIG/MAG welding is still the most widely utilized welding technique worldwide, relevant to steel, non-alloy steel, low alloy steel and also high alloy product. When welding stainless steel, MAG can satisfy the demands of sheet steel as thick within 0.6 mm. The protective gases utilized below are reactive gases such as carbon dioxide or combined gases.

Tips for stainless-steel MIG welding.

( 1) Flat characteristics of the welding power supply, DC making use of reverse polarity (welding wire linked to the favorable electrode).

( 2) Pure argon (purity of 99.99%) or Ar +2% O2, circulation price of 20|25L/min is appropriate.

( 3) Stainless steel MIG welding is generally under the conditions of jet transition welding, voltage to get used to the arc length in 4|6mm.

( 4) Windproof: MIG welding is at risk to the influence of the wind to create pores, so the wind rate above 0.5 m/s need to be taken windproof procedures.

( 5) Moisture-proof: outdoor welding needs to safeguard the work surface from dampness in order to make best use of the result of securing gas.

TIG welding:.

The arc is produced in between refractory tungsten electrode and the workpiece, which is a welding approach utilizing argon, helium as well as other inert gas as the securing gas. The welding is secure and formed well. TIG welding stainless steel with vertical exterior attributes of the power supply, making use of favorable polarity when DC (welding wire is connected to the negative electrode) since it has a deep penetration ability. TIG welding can be made use of to weld slim and average density stainless-steel sheets, as a root hand down a thicker section.

Tips for stainless-steel TIG welding.

( 1) The welding seam is good and also the welding contortion is little, is suitable for the welding of stainless-steel sheet under 6mm.

( 2) Argon is a safety gas with a purity of 99.99%. When the welding current is 50|150A, the flow price of argon is 8|10L/min, as well as when the current is 150|250A, the circulation price is 12|15L/min.

( 3) The size of the tungsten electrode from the gas nozzle to 4|5mm, in the place of fillet welding is 2|3mm, where with the deepness of the groove is 5|6mm, the range from the nozzle to the job is normally not greater than 15mm.

( 4) The rust as well as oil in the welding component have to be tidied up to stop welding pores.

( 5) The arc length of 1|3mm is the most effective, and also the security result is not good if it is also long.

( 6) When butt backing, the back side additionally requires gas defense in order to avoid the back of the bottom grain from oxidation.

( 7) In order to safeguard the welding swimming pool well with argon as well as facilitate the procedure, the Angle in between the facility line of tungsten electrode and also the work surface at the welding website should typically be maintained at 80|85 °, and the Angle between the filler cord and also the workpiece surface ought to be as small as possible, usually regarding 10 °.

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