Immersed arc welding preparation
The immersed arc welding must complete the basic work prior to the welding, including weldment's edge preparation,washing the the surface of parts to become soldered, welding parts set up, and surface cleaning, flux drying out,and so forth.
Edge preparation request based on the GB 986-1988 accomplishments, guaranteed the weld root doesn't present the transmission or even the entrapped slag, and lower the quantity of filler metal. Edge preparation may be used edge shaver, mechanized or semimechanized gas cutting machine,carbon arc gouging and so forth.
Cleaning the top of parts to become soldered
The welding parts cleaning is principally the elimination corrosion,the greasy grime and also the moisture content,to avoid the development gas hole. Generally uses the sand raging, the rotoblast method or even the manual elimination, if required, make use of the flame roast the various components to become welded. Before welding,the advantage as well as in along side it 20mm region from the edge including parts to become welded ought to be cleared up,make certain that there's no rust,oxide skin,greasy grime around the superficial.
The welding parts set up
When assembles the welding parts,it has to guarantee gap uniformity, exactly the same height, without unfitness of butt joint,orientation weld length is usually more than 30mm,and orientation weld quality and weld quality needs using the primary line. Utilization of special tools and fittings at the appropriate interval.
Assembles for that straight seam welded, must install the punching the arc board and also the run-off tab within the welded joint each side, and also to be slashed off after welding.its purpose is to help make the weld joint beginning terminal and finish terminal Acquiring the standard size welded joint section. furthermore additionally, it can get rid of the defect that create by arc strike and crater arc.
Welding material cleaning
The wire and flux from the immersed arc welding has affect on the weld metal composition,microstructure and qualities.Therefore prior to the welding, must eliminate welding wire surface oxide skin, rust and greasy grime and so forth. When flux upkeep must give consideration to moisture-proof,and before use,it has to based on agreement temperature drying out.