Effect of sulfur and oxygen on weld penetration of high-purity austenitic stainless steels

Aidun, D. K.; Martin, Scott A.

doi:10.1007/s11665-997-0121-1

Cited by 47 publications

(35 citation statements)

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“…4,5) The presence of sulphur can also ensure adequate weld penetration of stainless steel and therefore improve its performance. 6) On the other hand, sulphides can induce pitting corrosion and weaken the corrosion resistance of stainless steel. [2][3][4][5] To utilize the beneficial effects of the sulphide inclusions and to depress their detrimental effects, it is essential to control the sulphur content and sulphides formation in stainless steel production.…”

Section: Introductionmentioning

confidence: 99%

Desulphurisation and Inclusion Behaviour of Stainless Steel Refining by Using CaO–Al2O3 Based Slag at Low Sulphur Levels

et al. 2014

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The deep desulphurisation behaviour and steel cleanliness of stainless steel refining in the low sulphur content period (below 45 ppm [%S]) by using the current lime-fluorspar based slag and an optimized limealumina slag have been studied and compared. The desulphurisation effect was discussed based on the calculated sulphide capacity of slags and the equilibrated sulphur distribution ratio between the slag and steel. The sulphur evolution during the treatment was predicted with a previously developed kinetic model. The influence of slag chemistry on the compositional evolution of the steel and inclusions was discussed through thermodynamic considerations with respect to deoxidation and desulphurisation reactions. The sulphur content in the inclusions was predicted using the dissolved sulphur in the steel and their oxide chemistry. An equivalent steel cleanliness and desulphurisation effect was obtained with limealumina based slag as with lime-fluorspar based slag both in laboratory and industrial tests for low sulphur content stainless refining.

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Section: Introductionmentioning

confidence: 99%

Desulphurisation and Inclusion Behaviour of Stainless Steel Refining by Using CaO–Al2O3 Based Slag at Low Sulphur Levels

et al. 2014

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“…Dikenal beberapa gaya yang menentukan, yaitu tekanan, olakan, dan aliran cairan dalam kolam lasan. Keseimbangan aliran dalam kolam lasan ini ditentukan oleh gaya akibat tekanan busur, gaya gravitasi, gaya elektromagnetik, dan gaya akibat tegangan permukaan [1,2].…”

Section: Pendahuluanunclassified

Kekasaran dan Morfologi Hasil Pengelasan TIG Baja Tahan Karat 316 dengan Kadar Sulfur Berbeda

Shahab¹

2010

jtm

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ABSTRAKKeberadaan elemen impuritis dalam baja tahan karat seringkali tanpa diduga bisa menimbulkan masalah dalam pengelasan. Perbedaan dengan kadar yang sangat kecil elemen impuritis, seperti sulfur, dari sebuah heat ke heat yang lain, bisa menimbulkan kesulitan terutama pada pengelasan secara otomatis. Penelitian ini bertujuan untuk melihat pengaruh kadar sulfur baja terhadap pembentukan morfologi lasan yang ditunjukkan dengan perbedaan kekasaran permukaan dan pembentukan kolam lasan yang berbeda. Pengaruh kadar sulfur terhadap kekasaran permukaan kolam lasan dipelajari dengan mengadakan pengelasan Tungsten Inert Gas baja tahan karat 316 dengan kadar sulfur yang berbeda. Variasi morfologi kolam lasan, penetrasi (P) dan lebar (L) kolam lasan dan rasio P/L dikaitkan dengan kekasaran permukaan. Pengaruh sulfur dipelajari juga dengan peleburan dengan arus dan durasi penyalaan yang bervariasi. Pengaruh sulfur ditunjukkan dengan variasi diameter kolam lasan berbentuk lingkaran dan juga pada derajat tonjolan yang mencuat dari bawah spesimen. Hasil penelitian menunjukkan bahwa kekasaran permukaan baja sulfur tinggi selalu lebih besar dibanding baja sulfur rendah. Arah aliran cairan yang berbeda diajukan untuk menjelaskan fenomena ini. Kekasaran yang lebih besar ini diikuti dengan harga P/L yang lebih berarti. Pengamatan pada hasil peleburan dengan busur stasioner menghasilkan kesimpulan yang menarik. Pengaruh sulfur dalam menentukan morfologi kolam lasan lewat fenomena arah aliran cairan hanya berlaku pada rentang tertentu parameter penyalaan busur. Pada rentang yang lain, morfologi kolam lasan lebih banyak ditentukan oleh karakteristik busur, seperti anode spot, ketimbang arah aliran cairan.Kata kunci: Pengelasan TIG; baja tahan karat 316; sulfur; morfologi lasan; anode spot. ABSTRACT The presence of impurities in stainless steel can unexpectedly create a problem in welding. The difference of a small amount of impurities, from heat to heat, can induce the inconsistency in welding especially in automatic welding. This study is conducted to asses the influence of sulfur content of the steel on morphology of weld which is represented by the variation of weld pool and surface roughness of weld. The effect of sulfur on surface roughness of weld is studied in TIG welding of 316 stainless steels with different sulfur content. The influence of sulfur on the weld geometry, characterized by the ratio of depth and width of the weld (D/W), is studied in welding with various parameters. The variation of the weld geometry is conjointly studied in relation to

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“…For example, an oxide coating consisting of iron, chromium, silicon, titanium, manganese, nickel, cobalt, molybdenum and calcium has been reported to improve weldability and increase welding penetration in stainless steel. [4][5][6]16 The halogens, calcium fluoride, sodium fluoride, aluminium fluoride and silicon dioxide, have been reported to constrict the arc and to increase the welding depth penetration in titanium alloys. 13,14,17 Liu et al 8 discovered that using halogen elements in activating flux in A-TIG for titanium alloy (Ti-6Al-4V) obviously improves the welding penetration.…”

Section: Introductionmentioning

confidence: 99%

Martensite nucleation site and grain refinement in duplex titanium alloy weldment by active flux with nanoparticle addition

Hsu

Chen

Kao

et al. 2011

Science and Technology of Welding and Joining

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The effects of activating flux containing nanoparticles on the welding microstructure and hardness distribution of titanium alloy were investigated. The fluxes, consisting of NaF with 1 wt-% of either nano-TiO 2 or nanodiamond, effectively yielded refined grain size and deep weld penetration. The hardness of the weldment was close to that of the base metal for 99 wt-% NaF plus 1 wt-% diamond, leading to a desirable uniform mechanical property in the weld design. In the meantime, the transmission electron microscopy images illustrate that the nanoparticles promote b phase coarsening and martensitic a9 phase formation at the b veins.

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Effect of sulfur and oxygen on weld penetration of high-purity austenitic stainless steels

Cited by 47 publications

References 1 publication

Desulphurisation and Inclusion Behaviour of Stainless Steel Refining by Using CaO–Al2O3 Based Slag at Low Sulphur Levels

Desulphurisation and Inclusion Behaviour of Stainless Steel Refining by Using CaO–Al2O3 Based Slag at Low Sulphur Levels

Kekasaran dan Morfologi Hasil Pengelasan TIG Baja Tahan Karat 316 dengan Kadar Sulfur Berbeda

Martensite nucleation site and grain refinement in duplex titanium alloy weldment by active flux with nanoparticle addition

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