日本神鋼KOBELCO NO65G氬弧焊絲ER70S-2進(jìn)口焊絲

更新日期：2024年06月14日
有效期：360天
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關(guān)鍵字：NO65G焊絲 NO65G日本神鋼焊絲 NO65G進(jìn)口焊絲

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日本神鋼KOBELCO NO65G氬弧焊絲ER70S-2進(jìn)口焊絲

NO65G TIG rod, equivalent to AWS A5.18 ER70S-2, contains less C, Si and Mn contents than TG-S50 or TG-S51T; instead, Al, Ti and Zr are specially added. These elements help to decrease the amount of oxygen in the molten pool, allowing NO65G to provide a weld metal of relatively high cleanness. On the other hand, it is a little inferior to TG-S50 or TG-S51T in terms of fluidity of molten metal, bece of which its surface tension increases while the oxygen content in the molten metal is decreased.

Bece Al, Ti or Zr is an element with high oxygen affinity, slag can be generated on the bead surface after a part of the elementbines with oxygen in the molten metal during welding.ers are therefore advised to beware of weld defects, such as poor bead appearance or slag incion, ced by the slag.

Each chemical element in NO65G rod is strictly controlled to maintain a narrow range within the AWS A5.18 ER70S-2 specification so that it can meet the tough requirements set out by Japanese clients for mechanical properties in critical structural projects.

Table 8: Typical chemistry of weld metal (mass%)濟(jì)南駿焊

C	Si	Mn	P	S	Cu	Al	Ti	Zr
0.04	0.50	1.20	0.007	0.012	0.22	0.06	0.05	0.02

Table 9: Typical mechanical properties of weld metal

	Tensile test at RT			Absorbed energy (J)
	YS (MPa)	TS (MPa)	EI (%)	-40°C	-30°C	-20°C
As-welded	584	635	29	Av 165	Av 200	Av 215
625°C × 8hr	545	615	30	Av 138	Av 160	Av 175

Table 8, Table 9 and Figure 5 show the typical chemistry of NO65G weld metal, the typical mechanical properties in as-welded and PWHT (625°C×8 hr) conditions and the absorbed energies in relat ion to the tes t temperatures, respectively.

Figure 5: Impact properties of weld metal

Figures 6 and 7 show face side bead appearance after root and second passes and back bead appearance after root-pass welding in 1G and 3G (uphill) s by NO65G (2.4mm dia.), respectively. Figures 8 and 9 exhibit macro-structures of root-pass and second-pass welding in 1G and 3G (uphill) s, respectively. The groove configuration was of single 60°V, with a root gap of 3.0-3.5mm. The welding conditions were 110A-12V for root-pass without back-shielding and 160A-13V for second pass welding, respectively.

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