QC/T 1105-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| QC/T 1105-2019 | English | 160 |
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Earth bolt performance and test methods
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QC/T 1105-2019: Earth bolt performance and test methods---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT1105-2019
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040
T 31
Earth bolt performance and test methods
ISSUED ON: AUGUST 02, 2019
IMPLEMENTED ON: JANUARY 01, 2020
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Performance requirements for earth bolts ... 5
5 Preparation for electrical performance test ... 5
6 Test methods for electrical properties ... 6
Earth bolt performance and test methods
1 Scope
1.1 This standard specifies the grounding performance requirements and related test
methods for earth bolts.
1.2 This standard is applicable to the earth bolts, which have a thread specification M6
and M8, a mechanical performance grade 8.8, a product grade A.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Earth
Refers to the connection of a circuit, equipment, subsystem to the reference ground,
to provide an equipotential point or plane. The reference ground of the automotive
electronic system is the frame or the cabin; the negative wire of the battery is directly
placed on the frame or cabin.
3.2
Earth bolt
Connecting bolts, between the grounding points of circuits, equipment, subsystems
and the reference ground.
6.2 Common connection
6.2.1 Tightening by torque wrench
Each bolt shall be tightened, according to the minimum torque in Table 2. The voltage
drop shall be measured, according to 6.1. Then it is tightened, according to the
maximum torque in Table 2. The voltage drop shall be measured, according to 6.1. The
number of test earth bolts is 10.
6.2.2 Tightening by impact wrench
If an impact wrench is used, tighten it according to the torque setting of the production
process. Measure the voltage drop according to 6.1. The number of test bolts is 10.
6.3 Repeated disassembly & assembly
Take one tightening-disassembly & assembly of the earth bolt as 1 cycle. Repeat 10
cycles. When tightening, use the impact wrench only in the 1st cycle; use the torque
wrench after the 2nd cycle. Then carry out the voltage drop test, according to 6.1. The
number of test bolts is 10.
6.4 Salt spray
Hang the specimen with the earth bolt installed (see Figure 1) in the salt spray test
chamber. According to the neutral salt spray test in GB/T 10125, spray for 23 hours.
Then place it outside the salt spray test chamber, for 1 hour, during which it shall not
direct contact the specimen. After repeating 4 cycles, carry out the voltage drop test
according to 6.1. The number of test bolts is 10.
6.5 Vibration
Install the specimen on the vibration testing machine, in the three installation postures
as shown in Figure 4. Carry out the test, according to the conditions in Table 5. The
vibration directions are three directions perpendicular to each other in the up and down,
left and right, front and rear directions, as relative to the installation state. Then carry
out the voltage drop test according to 6.1. The number of test bolts is 10.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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