Products Spotlight - 神戸製鋼所

1 1 KOBELCO WELDING TODAYP roducts Spotlight Part of the DW stainless steel series, DW-309 MoLand DW-309 MoLP are special flux-cored are indispensable filler metals for weldingdissimilar metal joints, such as in the buffer layerof clad steels, and the underlayer for austenitic stainless steel (316L and317L), duplex stainless steel, carbon steel, andlow-alloy steel usually constitute such dissimilarmetal joints and clad steels. For the overlayingsubstrates, carbon steel and low-alloy steel areused.

2 The demand for cost effective clad steels inparticular, and thus for suitable filler metals, isexpected to increase due to the brisk business inthe relevant industries. DW-309 MoL and DW-309 MoLP are classified asAWS E309 LMoT0-1/-4 and E309 LMoT1-1/-4 respectively. As the AWS classifications indi-cate, the former is suitable for flat and horizontalfillet welding, whereas the latter is suitable forpositional welding; both wires use either CO2 gasor 75-80%Ar/20-25%CO2 mixture shielding typical chemical and mechanical properties ofthese wires are shown in Table DW-309 MoL and DW-309 MoLP weld metalscontain sufficient amounts of ferrite, they canaccommodate the detrimental effects caused bydilution by the carbon or low-alloy base effects may include the formation ofmartensite (brittle structure) and a fully austeniticstructure (sensitive to hot cracking)

3 In the weldmetal. Similar to mild-steel titanium-type flux-cored wires, these wires offer excellent usabilitywith a stable arc, low spatter, self-peeling slagremoval, regular bead shape, and glossy beadappearance. Table 2 shows an example of a weld-ing procedure for 317L stainless clad 1: Typical chemical and mechanical properties of DW-309 MoL and DW-309 MoLP deposited metals with CO2shielding gasProduct nameDW-309 MoLDW-309 MoLPC (%) (%) (%) (%) (%) (%) (%) (%) (%)11.

4 Ferrite percent per a Schaeffler PS (MPa)540540TS (MPa)720699El (%)30307KH ,QGLVSHQVDEOH )&:V IRU 'LVVLPLODU 0 HWDO :HOGLQJ LQ'HVDOLQDWLRQ 3 ODQWV &KHPLFDO 7 DQNHUV DQG 3 ODWV DQG3 DSHU 0 LOOV': 0R/ ': 0R/3': 0R/ ': 0R/3 Photo courtesy of Hitachizosen Co., 2: One-side welding of 317L stainless clad steel platewith DW-309 MoL and a FBB-3 backingPass metalSize (mm)Welding positionAmp.(A)Volt.(V)Speed(cm/min) Flat1902814 cladCarbon steelFBB-3backing50 (a) Weld pass sequence(b) Cross section macrostructure2 KOBELCO WELDING TODAYP reface Strong economies gear up business On the first of July, Hong Kong celebrated the 10thanniversary of its return to China.

5 10 years have passedsince 1997, when Hong Kong s political identitychanged from British colony to a Special AdministrativeRegion of China in the one county, two systems framework. In contrast to widespread pessimism thatquestioned Hong Kong s future prosperity and politicalstability right before the return, Hong Kong has seensubstantial economic growth, benefiting from the mobi-lization of people, goods, and money from China dur-ing the decade. The world will continue to pay specialattention to Hong Kong from the standpoint of econom-ics and politics in the the meantime, Intan Pertiwi Industry (INTIWI) in Indonesia, who has been apartner of Kobe Steel s since starting production of stick electrodes in 1977 underlicense from Kobe Steel, has celebrated their 30th anniversary this year.

6 They producemany kinds of stick electrodes including RB-26, LB-52, CIA-1, NC-38, and HF-350. Iappreciate their activities and contribution in helping Kobelco welding Products earn ahigh reputation. I hope both of us will maintain our fruitful world economies appear strong, and the demand for welding consumables androbots is healthy. We are making our best effort to supply enough quantity of productsto respond to global customers needs. Last but not least, I am happy to work with pro-Kobelco customers like you, who read KOBELCO WELDING TODAY, and I extendmy deepest appreciation for your support for Kobelco Products and TojoGeneral ManagerInternational Operations CompanyKobe Steel, : the business key wordIncidents that arouse our concerns about global warm-ing are occurring everywhere in the world in recentyears: abnormal sea-level rises, extreme hot weather,drought, and more.

7 Such abnormal phenomena are nowbelieved to have been caused by such human activitiesas emitting excessive carbon dioxide into the air. Wemust take these phenomena seriously as a warning fromthe earth. To disregard these signs of warning is certainto adversely affect the healthy prosperity of the cominggenerations. In this sense, it is imperative that every per-son and every enterprise do whatever they can with asense of urgency. In Japan, it may be possible to con-serve resources by reducing the use of plastic bags forshopping and disposable chopsticks as well as to develop hydrogen as an alternativecar fuel.

8 One automobile manufacturer is said to be eyeing the development of a carthat purifies the air as it Steel has also developed environmentally-friendly non-copper-coated solidwires (SE-50T, SEA-50, etc.) ahead of other manufacturers. Such wires enjoy a goodreputation among customers certified by ISO 14000. Also, the demand for LB-52U, acovered arc welding electrode for pipelines, has been increasing remarkably mainly inRussia. The electrode is used for gas and oil pipelines in particular. I hope the elec-trode will also be used for water pipelines as securing drinking water has become aproblem recent years.

9 We will put more emphasis on the development of such environ-mentally-conscious Products . I hope you will support us in this effort. Toshiyuki OkuzumiGeneral ManagerInternational Operations CompanyKobe Steel, wire for dissimilar metal weldingP3-7 Types of wear and suitable hardfacing filler metals"P8 Welding of 13%Mn steels7 KDLODQG DQG 6 LQJDSRUH 7 KDLODQG DQG 6 LQJDSRUH 7 HFKQLFDO 6 HUYLFHVIRU &XVWRPHUV LQP9-10 Reports from TKW and KWS%106'0653 KOBELCO WELDING TODAYT echnical Highlight Hardfacing is the application of a hard, wear-resis-tant material to the surface of a workpiece bywelding, spraying.

10 Or allied welding processes, toreduce wear or loss of material caused by frictionor abrasion. Hardfacing is carried out either duringmaintenance to reclaim machinery parts by repair-ing worn or lost surfaces, or in production to addhard, wear-resistant weld metals to the surfaces ofmachinery parts. This article will focus onhardfacing by arc welding, concentrating on thevarieties of filler metals and how to select metals can be worn in serviceWear can be defined as the deterioration of metalsurfaces that occurs through mechanical action orby destructive thermal or chemical contact.