Stainless steel pipe welding technology to meet the conditions

Views: 4     Author: Site Editor     Publish Time: 2016-09-19      Origin: Site

Due to the stainless steel pipe sizes, according to the welding of stainless steel pipe fittings unique place, as far as possible reduce the amount of heat input, the manual electric arc welding, argon arc welding is adopted two kinds of methods, d > Φ 159 mm adopts argon arc welding, manual arc welding surface.D ≦ Φ 159 mm all use argon arc welding.Stainless steel pipe welding technology to meet the conditions.
 Stainless steel pipe welding technology to meet the conditions
(1) manual arc welding with welding machine adopts dc reverse connection, when using dc argon arc welding is pick up;
(2), it should be before welding wire with oxide coating on the surface of the stainless steel wire brush to brush off, with acetone to wash;Electrode should be in 200-250 ℃ drying 1 h, as you take;
(3) the workpiece before welding groove on both sides of the 25 mm within the scope of the clean up oil pollution and so on, with acetone to wash groove on both sides of the 25 mm;
 Stainless steel pipe welding technology to meet the conditions
(4) argon arc welding, the nozzle Φ 2 mm in diameter, extremely rich tungsten tungsten electrode, specifications Φ 2.5 mm;
(5) argon arc welding of stainless steel, the back must be filled argon gas protection, to ensure forming on the back.Using the method of partial argon filling in the pipe flow for 5-14 l/min, positive argon gas flow is 12 13 l/min.
Backing welding seam thickness should be thin as far as possible, and the roots of the fusion outstanding, when you receive arc into a gentle slope shape, if there are any are-receive shrinkage cavity, polishing machine grinding.Must be within the groove arc arc, arc should fill arc crater and prevent the crack of arc crater.
 Stainless steel pipe welding technology to meet the conditions
Because the stainless steel pipe fittings for austenitic stainless steel pipe, in order to prevent the carbide precipitation sensitization and intergranular decay, should strictly control the interpass temperature and cooling rate after welding, the welding interlayer temperature control under 60 ℃, must immediately after welding water-cooled, by subsection welding at the same time.The symmetrical dispersed welding sequence, can increase the cooling rate of joint, but also decrease the welding stress.

  • Q Are you a manufacturer or a trader?

    We have our own foundry ,forging factory and machinery shop located in Liaoning Province, China.
  • Q What can you do for customer?

    One Stop Service
    1).Manufacturing and supply various machinery parts.
    2). Technical analysis and design 
    3).Factory audit, on-site production supervision, in-time feedback, pre-shipment quality inspection
  • Q How could you commit the product quality?

    1) all our factories were ISO certified. 
    2) more than 50% of New Densen’s products were sold to worldwide top 500 companies 
    which located in North American, Western Europe, and Japan.
    3) New Densen’s QC engineers will do on-site supervision and before EX-work quality inspection. New Densen will issue inspection reports for customers’ approval before EX-work. New Densen will be responsible for its reports and every parts no matter how long sold to customers.
  • Q How long shall we get the quotation?

    Processing time for inquiry: 1-3 working days.
  • Q What's the process of developing a new steel casting product?

    The procedure for new project develop as below:
    1. Technical department analyze the drawings all details 
    2.Pattern design and manufacture
    3.Casting Process
    4.Quality Control inspect the casting parts
    5.Issue inspection report for customer to check quality
    6. After inspection report approved, Logistics Department help arrange the shipping to customer