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FAMILIARC? US-36 3 FAMILIARC? AF-490AS

Table 8: Description of US-36/AF-490AS

Classification	AWS A5.17 F7A6-EH14; F7P6-EH14
Features	Butt welding of medium and heavy plate
	Multi-pass welding only
	Excellent notch toughness at low temperature down to -40℃
Polarity	DCEP
Boniszewski basicity	2.6
Shipping approval	ABS, DNV, LR, GL, BV

US-36/AF-490AS is a solid wire/flux combination for welding mild steels as well as HT490 class steels. AF-490AS, a fluoride-basic agglomerated flux, shows superb and stable notch toughness down to -40°C as well as good usability in combination with US-36 SAW wire. Details related to US-36 x AF-490E are shown in Table 8.

3-1. Properties of all weld metal

The chemistries and mechanical properties of the all weld metal are shown in Tables 9 and 10, respectively. Impact test results in the as-welded condition as well as after Postweld Heat Treatment (PWHT) are shown in Figures 9 and 10 by the transition curves, respectively.

Designed for optimum flux basicity, AF-490AS can obtain stable and excellent notch toughness at temperatures as low as -40°C even though no special elements have been added. The bead appearance is shown in Figure 11.

Table 9: Chemical composition of all weld metal (mass %)

	C	Si	Mn	P	S
US-36 / AF-490AS	0.07	0.39	1.62	0.014	0.004
Note: Welding conditions: 550A-30V-42cpm; Ext=30mm

Table 10: Mechanical properties of all weld metal

		0.2%OS (MPa)	TS (MPa)	El (%)
US-36/ AF-490AS	As-welded	516	598	32
	PWHT (620℃ x 1hr)	547	565	32
AWS spec. (As-welded & PWHT)		375 min	490-660	22 min
Note: Welding conditions: 550A-30V-42cpm; Ext=30mm