This standard specifies the basic form and size of the groove of submerged arc welding. This standard applies to submerged arc welding joints of carbon steel and low alloy steel. GB 986-1988 Basic form and size of submerged arc welding groove GB986-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Baslc forms and sizes of weld grooves for submerged arc welding
1 Main content and scope of application
This standard specifies the basic forms and sizes of weld grooves for submerged arc welding. This standard is applicable to submerged arc welding joints of carbon steel and low alloy steel. 2 Reference standards
GB324 Symbolic representation of welds on drawings The basic forms and sizes of weld grooves for submerged arc welding shall comply with the provisions of Table 1. 4 The symbols for the weld chain in the drawings shall comply with the provisions of GB324 standard. 5 In order to obtain full penetration welds, sufficient weld root cleaning is allowed UDC 621.191.76
GB 986-88
Replace GB985-80
6 Basic forms and sizes of grooves for butt welds of steel plates of different thicknesses For important load-bearing joints of butt welds of steel plates of different thicknesses, if the difference in thickness between the two plates (8-1) meets the requirements of Table 2, the groove size is selected according to the thickness of the thick plate, otherwise, the thick steel plate shall be thinned according to the provisions of Figure 1. Single-sided thinning of thick plates shall be in accordance with the provisions of Figure 1 (a), and double-sided thinning shall be in accordance with the provisions of Figure 1 (b), and the thinning length L≥3 (-). Approved by the National Bureau of Standards on June 25, 1988
Implemented on March 1, 1989
Thickness of workpiece, mm
3 ~ 10
6 ~ 2h
「Slope 1
GB986-88
I Shaped belt pad glass LI
Belt armor edge
Single side red bevel
Mouth form
Weld seam form
35～50）
GB986-88
Mouth groove size
Effective thickness value of weld seam
Back welding is allowed to use any clearbZxz.net
Allowed welding side to use carbon frequency gas bag!
HD1 and TD protection
molten pool
HD protection molten pool
To serial number 3
Same as serial number 4
Same as serial number 3
Workpiece thickness, mm
20 ~50
10 ~30
GB986-
With blunt edge
Single-sided V-shaped belt pad slope[1
With blunt edge
Single-sided V-shaped lock groove
With blunt edge
J-shaped groove
Y-shaped glass groove
Y-shaped glass groove with pad
KANHYKAC
Welding wall form
20°～40
(6°~12°)
50° ~81°
10~ - 80°
40°6°
GB986-88
Slot size
Inch, mm
3—10
Same as No. 4
Same as No. 3
[Thickness d, mm
16 ~ 30
6 16
30 ~ 641
20 ～ 30
24 ~ 60
GB 986-88
Y-shaped locking groove
Reverse Y-shaped groove
VY-shaped composite groove
Single-sided V-shaped groove with blunt edge effect
Double-Ya Bin slope
TKAONHYKAG
Select chain form
40~-60°
60°～~70
(8-12~)
65*~72
45:~60 -
40″50
50- 80
GB 986-88
1 ～ 3
Manual open arc welding is used on the groove side
Same as serial number 3
Bottom welding is done by any arc welding,
Full penetration to the highest degree
Asymmetric groove is allowed
=only α value is marked.
Allowing to use asymmetric angles,
height asymmetry, angle height asymmetry, double "" glass [I
upper thickness 3, mm
80 ~ 250
GB 986-88
double U-shaped groove with blunt edge
UY-shaped groove
honey gap groove
one-shaped groove
weld form
(5\～12'
(5°-10°)
7080°
(1°~3°)
70°～80°
GB 946-88
groove size
9 ~11
8 ～11
1, 8=P, only marked.
2. It is allowed to use double U\ grooves with asymmetric angles and heights. The same as serial number 2
1. The case gap slope. 1 is suitable for the first
welding, with two passes per layer.
2. Any open arc is used on the inner groove side
The same as serial number 2
The upper thickness, m
10～20
30-120
GB 986—88
Single-sided √-shaped groove with blunt edge
Double-sided single-sided groove with blunt edge
Single-sided paper joint with blunt edge
Seam form
GB 986—88
Groove size
(35~45-) 0 ~2.5
40 ~ 50
Same as No. 2
Same as No. 2
Same as No. 2
Workpiece thickness, m
10 —40
301 ~60
|Wave
GB 9B6-88
Single-sided √-shaped slope with blunt edge
Double-sided V-shaped slope with blunt edge
Double-sided ”-shaped slope with blunt edge
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