BE831899A - AGGLOMERATE FLOWS FOR AUTOMATIC SUBMERSIBLE ARC WELDING OF ORDINARY OR LOW ALLIED STEELS - Google Patents

Description

       

  "Agglomerated fluxes for automatic submerged arc welding of ordinary steel * or

  
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dage sous flux) had in its beginnings, the important drawback of providing only relatively low resilience in comparison.

  
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when the dilution of the weld metal in the base metal is reduced by two specific effects:
- the fractionation, over time, of the total heat input, and <EMI ID = 4.1>

  
min. ).

  
Reasoning by analogy with steel operations, in which the refining of steels is obtained by successive oxidation and reduction reactions, we sought to increase the resilience of AS weld seams. in introduction

  
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tion and compensating for their effects, in a second step, by the use of solid electrodes with relatively high contents

  
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vorable to their infiltration into deep joints and) X and Y.

  
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tes (more than 15%), whose endothermic decomposition absorbs part of the arc heat. These fluxes are used in conjunction with electrodes with relatively high concentrations of

  
Mn (+ 1.5%) and Si (+ 1%).

  
During our selective research among the feeds &#65533; based on alkali metal or alkaline earth oxides - an area covered by numerous patents, British patent '1,080,337 in particular
- we discovered, unexpectedly, that by adding <EMI ID = 9.1>

  
percentages of CaCO3, it was possible to obtain not only good penetration of the X or Y joints in two passes, without an intermediate "bubble", but also increased resilience in unexpected proportions (by 40% higher).

  
The agglomerated flows according to the invention are characterized by the percentage compositions of mixtures of powders which are bound to sodium silicate, in an amount of 130 to 200 g. of silicate per kg of powder and then fired at temperatures ranging

  
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By welding, in submerged arc, with these compositions coated sheets (steel 52) of 20 mm. thick, chamfered in X and Y (see single figure) in two passes (recto-verso) in

  
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 <EMI ID = 13.1> The weld is sound and, in particular, without porosity at the interface of the two passes.

  
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The substitution of two parts of CaCo3 for two parts of MgO thus caused an unexpected increase in resilience of

  
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The use of such fluxes in AS welding of thick sheets, on site, therefore makes it possible to economically meet the specifications of shipbuilding and civil engineering.

CLAIMS.

  
1. Process of submerged arc welding, in coarse horizontal passes, of thick sheets of ordinary or weak steels.

  
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ques obtained by mixing a mixture of powders with silica

  
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kilogram of mixture, mixing followed by cooking in a trommel between
500 to 1000 [deg.] Cg. Said mixtures of powders having compositions which meet the qualitative and quantitative conditions of dosage below:

  

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2. Agglomerated flows for the execution of the solvent process.


    

Claims (1)

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