diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 4c6c3f177..ea68150b1 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -27,6 +27,9 @@ changes
 -  The ``wx_property_tag`` validator now also accepts lists of different tags. [:pull:`670`]
    When multiple tags are passed, validation will fail if *none* of the supplied patterns match.
 
+- Due to a `pandas` update, using the + operator with `Time` and either a `pandas.TimedeltaIndex` or `pandas.DatetimeIndex`
+  now only works if the `Time` instance is on the left-hand side. [:pull:`684`]
+
 fixes
 =====
 
diff --git a/weldx/asdf/cli/welding_schema.py b/weldx/asdf/cli/welding_schema.py
index 575e826cb..4b65aad82 100644
--- a/weldx/asdf/cli/welding_schema.py
+++ b/weldx/asdf/cli/welding_schema.py
@@ -28,21 +28,23 @@ def single_pass_weld_example(
     import pandas as pd
     from asdf.tags.core import Software
 
-    # importing the weldx package with prevalent default abbreviations
-    import weldx
     import weldx.geometry as geo
     import weldx.measurement as msm
-    from weldx import Q_, GmawProcess
-    from weldx import LocalCoordinateSystem as lcs
-    from weldx import TimeSeries, WXRotation, get_groove
-    from weldx.asdf.util import get_schema_path, write_buffer
-    from weldx.constants import META_ATTR
-    from weldx.core import MathematicalExpression
+
+    # importing the weldx package with prevalent default abbreviations
+    import weldx.transformations as tf
+    from weldx.asdf.util import get_schema_path, write_buffer, write_read_buffer
+    from weldx.constants import META_ATTR, Q_
+    from weldx.core import MathematicalExpression, TimeSeries
     from weldx.tags.aws.process.gas_component import GasComponent
     from weldx.tags.aws.process.shielding_gas_for_procedure import (
         ShieldingGasForProcedure,
     )
     from weldx.tags.aws.process.shielding_gas_type import ShieldingGasType
+    from weldx.tags.processes.process import GmawProcess
+    from weldx.transformations.local_cs import LocalCoordinateSystem as lcs
+    from weldx.transformations.rotation import WXRotation
+    from weldx.welding.groove.iso_9692_1 import get_groove
     from weldx.welding.util import sine
 
     # Timestamp
@@ -73,7 +75,7 @@ def single_pass_weld_example(
 
     # Setup the Coordinate System Manager (CSM)
     # crete a new coordinate system manager with default base coordinate system
-    csm = weldx.transformations.CoordinateSystemManager("base")
+    csm = tf.CoordinateSystemManager("base")
 
     # add the workpiece coordinate system
     csm.add_cs(
@@ -298,7 +300,7 @@ def single_pass_weld_example(
     model_path = get_schema_path("single_pass_weld-0.1.0.yaml")
 
     # pre-validate?
-    weldx.asdf.util.write_read_buffer(
+    write_read_buffer(
         tree,
         asdffile_kwargs=dict(custom_schema=str(model_path)),
     )
diff --git a/weldx/asdf/file.py b/weldx/asdf/file.py
index 99dc0b09f..faa6b318a 100644
--- a/weldx/asdf/file.py
+++ b/weldx/asdf/file.py
@@ -426,7 +426,7 @@ def software_history_entry(self):
     def software_history_entry(self, value: dict):
         """Set the software used for making history entries."""
         if value is None:
-            from weldx import __version__ as version
+            from weldx._version import __version__ as version
 
             self._DEFAULT_SOFTWARE_ENTRY = {
                 "name": "weldx",
diff --git a/weldx/asdf/util.py b/weldx/asdf/util.py
index bd0d50c67..9fb992a5b 100644
--- a/weldx/asdf/util.py
+++ b/weldx/asdf/util.py
@@ -116,7 +116,7 @@ def show(wx):
 
     if _use_weldx_file:
         write_kwargs = dict(all_array_storage="inline")
-        from weldx import WeldxFile
+        from weldx.asdf.file import WeldxFile
 
         with WeldxFile(
             tree=tree,
@@ -171,7 +171,7 @@ def read_buffer(
     if _use_weldx_file is None:
         _use_weldx_file = _USE_WELDX_FILE
     if _use_weldx_file:
-        from weldx import WeldxFile
+        from weldx.asdf.file import WeldxFile
 
         return WeldxFile(buffer, asdffile_kwargs=open_kwargs)
 
diff --git a/weldx/tags/debug/test_shape_validator.py b/weldx/tags/debug/test_shape_validator.py
index 3b766a9b6..7c43a1594 100644
--- a/weldx/tags/debug/test_shape_validator.py
+++ b/weldx/tags/debug/test_shape_validator.py
@@ -4,8 +4,9 @@
 import pandas as pd
 import pint
 
-from weldx import Q_, TimeSeries
 from weldx.asdf.util import dataclass_serialization_class
+from weldx.constants import Q_
+from weldx.core import TimeSeries
 
 __all__ = ["ShapeValidatorTestClass", "ShapeValidatorTestClassConverter"]
 
diff --git a/weldx/tags/debug/test_unit_validator.py b/weldx/tags/debug/test_unit_validator.py
index b1e4cb856..f36a8e367 100644
--- a/weldx/tags/debug/test_unit_validator.py
+++ b/weldx/tags/debug/test_unit_validator.py
@@ -3,8 +3,8 @@
 import numpy as np
 import pint
 
-from weldx import Q_
 from weldx.asdf.util import dataclass_serialization_class
+from weldx.constants import Q_
 
 __all__ = ["UnitValidatorTestClass", "UnitValidatorTestClassConverter"]
 
diff --git a/weldx/tests/asdf_tests/test_asdf_gmaw_process.py b/weldx/tests/asdf_tests/test_asdf_gmaw_process.py
index fb3c61349..be92035ae 100644
--- a/weldx/tests/asdf_tests/test_asdf_gmaw_process.py
+++ b/weldx/tests/asdf_tests/test_asdf_gmaw_process.py
@@ -2,8 +2,8 @@
 
 import pytest
 
-from weldx import Q_
 from weldx.asdf.util import write_read_buffer
+from weldx.constants import Q_
 from weldx.core import TimeSeries
 from weldx.welding.processes import GmawProcess
 
diff --git a/weldx/tests/asdf_tests/test_asdf_measurement.py b/weldx/tests/asdf_tests/test_asdf_measurement.py
index a94675f88..c540df770 100644
--- a/weldx/tests/asdf_tests/test_asdf_measurement.py
+++ b/weldx/tests/asdf_tests/test_asdf_measurement.py
@@ -1,7 +1,7 @@
 import pytest
 
-from weldx import Q_
 from weldx.asdf.util import write_read_buffer
+from weldx.constants import Q_
 from weldx.core import MathematicalExpression
 from weldx.measurement import (
     Error,
diff --git a/weldx/tests/asdf_tests/test_asdf_time.py b/weldx/tests/asdf_tests/test_asdf_time.py
index 589b12277..1b2ba049e 100644
--- a/weldx/tests/asdf_tests/test_asdf_time.py
+++ b/weldx/tests/asdf_tests/test_asdf_time.py
@@ -3,8 +3,8 @@
 import pandas as pd
 import pytest
 
-from weldx import Time
 from weldx.asdf.util import write_buffer, write_read_buffer
+from weldx.time import Time
 
 
 @pytest.mark.parametrize(
diff --git a/weldx/tests/asdf_tests/test_asdf_util.py b/weldx/tests/asdf_tests/test_asdf_util.py
index 5b0b7dfe6..db5cd6398 100644
--- a/weldx/tests/asdf_tests/test_asdf_util.py
+++ b/weldx/tests/asdf_tests/test_asdf_util.py
@@ -7,7 +7,7 @@
 import numpy as np
 import pytest
 
-from weldx import WeldxFile
+from weldx.asdf.file import WeldxFile
 from weldx.asdf.util import (
     dataclass_serialization_class,
     get_highest_tag_version,
diff --git a/weldx/tests/asdf_tests/test_asdf_validators.py b/weldx/tests/asdf_tests/test_asdf_validators.py
index af4787fd2..013c17100 100644
--- a/weldx/tests/asdf_tests/test_asdf_validators.py
+++ b/weldx/tests/asdf_tests/test_asdf_validators.py
@@ -4,10 +4,11 @@
 import pytest
 from asdf import ValidationError
 
-from weldx import Q_, TimeSeries
 from weldx.asdf.types import WxSyntaxError
 from weldx.asdf.util import write_buffer, write_read_buffer
 from weldx.asdf.validators import _custom_shape_validator
+from weldx.constants import Q_
+from weldx.core import TimeSeries
 from weldx.tags.debug.test_property_tag import PropertyTagTestClass
 from weldx.tags.debug.test_shape_validator import ShapeValidatorTestClass
 from weldx.tags.debug.test_unit_validator import UnitValidatorTestClass
diff --git a/weldx/tests/asdf_tests/test_weldx_file.py b/weldx/tests/asdf_tests/test_weldx_file.py
index ab6c0c584..5f447ab12 100644
--- a/weldx/tests/asdf_tests/test_weldx_file.py
+++ b/weldx/tests/asdf_tests/test_weldx_file.py
@@ -12,9 +12,8 @@
 import xarray as xr
 from jsonschema import ValidationError
 
-from weldx import WeldxFile
 from weldx.asdf.cli.welding_schema import single_pass_weld_example
-from weldx.asdf.file import _PROTECTED_KEYS, DEFAULT_ARRAY_INLINE_THRESHOLD
+from weldx.asdf.file import _PROTECTED_KEYS, DEFAULT_ARRAY_INLINE_THRESHOLD, WeldxFile
 from weldx.asdf.util import get_schema_path
 from weldx.constants import META_ATTR
 from weldx.types import SupportsFileReadWrite
diff --git a/weldx/tests/test_config.py b/weldx/tests/test_config.py
index 43cf3c1d6..3f6d4f02f 100644
--- a/weldx/tests/test_config.py
+++ b/weldx/tests/test_config.py
@@ -4,7 +4,7 @@
 import asdf
 import pytest
 
-from weldx import WeldxFile
+from weldx.asdf.file import WeldxFile
 from weldx.config import QualityStandard, add_quality_standard, enable_quality_standard
 from weldx.constants import META_ATTR
 from weldx.measurement import MeasurementEquipment
diff --git a/weldx/tests/test_geometry.py b/weldx/tests/test_geometry.py
index abe65d0f6..9dfd007cf 100644
--- a/weldx/tests/test_geometry.py
+++ b/weldx/tests/test_geometry.py
@@ -15,9 +15,10 @@
 import weldx.geometry as geo
 import weldx.tests._helpers as helpers
 import weldx.transformations as tf
-from weldx import Q_, CoordinateSystemManager
+from weldx.constants import Q_
 from weldx.geometry import SpatialData
 from weldx.transformations import WXRotation
+from weldx.transformations.cs_manager import CoordinateSystemManager
 
 from ._helpers import matrix_is_close, vector_is_close
 
diff --git a/weldx/tests/test_time.py b/weldx/tests/test_time.py
index b2c99859c..50154e6ef 100644
--- a/weldx/tests/test_time.py
+++ b/weldx/tests/test_time.py
@@ -13,8 +13,10 @@
 from pandas import Timestamp, date_range
 from pint import DimensionalityError
 
-from weldx import Q_, LocalCoordinateSystem, TimeSeries
+from weldx.constants import Q_
+from weldx.core import TimeSeries
 from weldx.time import Time, types_time_like
+from weldx.transformations.local_cs import LocalCoordinateSystem
 
 
 def _initialize_delta_type(cls_type, values, unit):
diff --git a/weldx/tests/transformations/test_cs_manager.py b/weldx/tests/transformations/test_cs_manager.py
index 1160c4fdf..2f75ba24d 100644
--- a/weldx/tests/transformations/test_cs_manager.py
+++ b/weldx/tests/transformations/test_cs_manager.py
@@ -11,8 +11,9 @@
 from pandas import Timestamp as TS  # noqa
 
 import weldx.transformations as tf
-from weldx import Q_, SpatialData
+from weldx.constants import Q_
 from weldx.core import MathematicalExpression, TimeSeries
+from weldx.geometry import SpatialData
 from weldx.tests._helpers import get_test_name, matrix_is_close
 from weldx.time import Time, types_time_like, types_timestamp_like
 from weldx.transformations import CoordinateSystemManager as CSM  # noqa
diff --git a/weldx/tests/transformations/test_local_cs.py b/weldx/tests/transformations/test_local_cs.py
index a45cd093a..53f4e3108 100644
--- a/weldx/tests/transformations/test_local_cs.py
+++ b/weldx/tests/transformations/test_local_cs.py
@@ -13,7 +13,7 @@
 
 import weldx.transformations as tf
 import weldx.util as ut
-from weldx import Q_
+from weldx.constants import Q_
 from weldx.core import MathematicalExpression, TimeSeries
 from weldx.tests._helpers import get_test_name
 from weldx.time import Time
diff --git a/weldx/transformations/cs_manager.py b/weldx/transformations/cs_manager.py
index f25f06638..6cfb7d7f8 100644
--- a/weldx/transformations/cs_manager.py
+++ b/weldx/transformations/cs_manager.py
@@ -26,8 +26,6 @@
     import matplotlib.axes
     import networkx as nx
 
-    import weldx  # noqa
-
 
 _DEFAULT_LEN_UNIT = UREG.millimeters
 _DEFAULT_ANG_UNIT = UREG.rad
@@ -193,7 +191,7 @@ def __eq__(self, other: Any):
 
     @property
     def lcs(self) -> list[LocalCoordinateSystem]:
-        """Get a list of all attached `~weldx.transformations.LocalCoordinateSystem` \
+        """Get a list of all attached `LocalCoordinateSystem` \
         instances.
 
         Only the defined systems and not the automatically generated inverse systems
@@ -201,9 +199,8 @@ def lcs(self) -> list[LocalCoordinateSystem]:
 
         Returns
         -------
-        List[~weldx.transformations.LocalCoordinateSystem] :
-           List of all attached `~weldx.transformations.LocalCoordinateSystem`
-           instances.
+        list[LocalCoordinateSystem] :
+           List of all attached `LocalCoordinateSystem` instances.
 
         """
         return [
@@ -214,14 +211,12 @@ def lcs(self) -> list[LocalCoordinateSystem]:
 
     @property
     def lcs_time_dependent(self) -> list[LocalCoordinateSystem]:
-        """Get a list of all attached time dependent \
-        `~weldx.transformations.LocalCoordinateSystem` instances.
+        """Get a list of all attached time dependent `LocalCoordinateSystem` instances.
 
         Returns
         -------
-        List[~weldx.transformations.LocalCoordinateSystem] :
-            List of all attached time dependent
-            `~weldx.transformations.LocalCoordinateSystem` instances
+        list[LocalCoordinateSystem] :
+            List of all attached time dependent `LocalCoordinateSystem` instances
 
         """
         return [lcs for lcs in self.lcs if lcs.is_time_dependent]
@@ -473,19 +468,17 @@ def add_cs(
             Name of the parent system. This must have been already added.
         lcs
             An instance of
-            `~weldx.transformations.LocalCoordinateSystem` that describes how the new
+            `LocalCoordinateSystem` that describes how the new
             coordinate system is oriented in its parent system.
         lsc_child_in_parent
-            If set to `True`, the passed
-            `~weldx.transformations.LocalCoordinateSystem` instance describes
+            If set to `True`, the passed `LocalCoordinateSystem` instance describes
             the new system orientation towards is parent. If `False`, it describes
             how the parent system is positioned in its new child system.
 
         """
         if not isinstance(lcs, LocalCoordinateSystem):
             raise TypeError(
-                "'local_coordinate_system' must be an instance of "
-                + "weldx.transformations.LocalCoordinateSystem"
+                "'local_coordinate_system' must be an instance of LocalCoordinateSystem"
             )
 
         if (
@@ -650,7 +643,7 @@ def create_cs(
         """Create a coordinate system and add it to the coordinate system manager.
 
         This function uses the ``__init__`` method of the
-        `~weldx.transformations.LocalCoordinateSystem` class.
+        `LocalCoordinateSystem` class.
 
         Parameters
         ----------
@@ -672,8 +665,7 @@ def create_cs(
         time_ref :
             Reference time for time dependent coordinate systems
         lsc_child_in_parent :
-            If set to `True`, the passed
-            `~weldx.transformations.LocalCoordinateSystem` instance describes
+            If set to `True`, the passed `LocalCoordinateSystem` instance describes
             the new system orientation towards is parent. If `False`, it describes
             how the parent system is positioned in its new child system.
 
@@ -697,8 +689,8 @@ def create_cs_from_euler(
     ):
         """Create a coordinate system and add it to the coordinate system manager.
 
-        This function uses the `~weldx.transformations.LocalCoordinateSystem.from_euler`
-        method of the `~weldx.transformations.LocalCoordinateSystem` class.
+        This function uses the `LocalCoordinateSystem.from_euler` method of the
+        `LocalCoordinateSystem` class.
 
         Parameters
         ----------
@@ -734,8 +726,7 @@ def create_cs_from_euler(
         time_ref :
             Reference time for time dependent coordinate systems
         lsc_child_in_parent :
-            If set to `True`, the passed
-            `~weldx.transformations.LocalCoordinateSystem` instance describes
+            If set to `True`, the passed `LocalCoordinateSystem` instance describes
             the new system orientation towards is parent. If `False`, it describes
             how the parent system is positioned in its new child system.
 
@@ -762,9 +753,8 @@ def create_cs_from_axis_vectors(
     ):
         """Create a coordinate system and add it to the `CoordinateSystemManager`.
 
-        This function uses the
-        `~weldx.transformations.LocalCoordinateSystem.from_axis_vectors`
-        method of the `~weldx.transformations.LocalCoordinateSystem` class.
+        This function uses the `LocalCoordinateSystem.from_axis_vectors`
+        method of the `LocalCoordinateSystem` class.
 
         Parameters
         ----------
@@ -785,8 +775,7 @@ def create_cs_from_axis_vectors(
         time_ref :
             Optional reference timestamp if ``time`` is a time delta.
         lsc_child_in_parent :
-            If set to `True`, the passed
-            `~weldx.transformations.LocalCoordinateSystem` instance describes
+            If set to `True`, the passed `LocalCoordinateSystem` instance describes
             the new system orientation towards is parent. If `False`, it describes
             how the parent system is positioned in its new child system.
 
@@ -900,7 +889,7 @@ def get_child_system_names(
 
         Returns
         -------
-        List[str]:
+        list[str]:
             List of child systems.
 
         """
@@ -928,7 +917,7 @@ def coordinate_system_names(self) -> list:
 
         Returns
         -------
-        List :
+        list :
             List of coordinate system names.
 
         """
@@ -940,7 +929,7 @@ def data_names(self) -> list[str]:
 
         Returns
         -------
-        List[str] :
+        list[str] :
             Names of the attached data sets
 
         """
@@ -1084,7 +1073,7 @@ def get_cs(
 
         Returns
         -------
-        `~weldx.transformations.LocalCoordinateSystem` :
+        `LocalCoordinateSystem` :
             The requested coordinate system.
 
         Notes
@@ -1150,15 +1139,14 @@ def get_cs(
            reference times. Therefore an exception is raised. If your intention is to
            add a reference time to the resulting coordinate system, you should call this
            function without a specified reference time and add it explicitly to the
-           returned `~weldx.transformations.LocalCoordinateSystem`.
+           returned `LocalCoordinateSystem`.
 
 
         **Information regarding the implementation:**
 
         It is important to mention that all coordinate systems that are involved in the
         transformation should be interpolated to a common time line before they are
-        combined using the `~weldx.transformations.LocalCoordinateSystem` 's __add__
-        and __sub__ functions.
+        combined using the `LocalCoordinateSystem` 's __add__ and __sub__ functions.
         If this is not done before, serious interpolation errors for rotations can
         occur. The reason is, that those operators also perform time interpolations
         if the timestamps of 2 systems do not match. When chaining multiple
@@ -1642,7 +1630,7 @@ def time_union(
         """Get the time union of all or selected local coordinate systems.
 
          If neither the `CoordinateSystemManager` nor its attached
-         `~weldx.transformations.LocalCoordinateSystem` instances possess a reference
+         `LocalCoordinateSystem` instances possess a reference
          time, the returned ``Time`` object would not contain one either.
 
         Parameters
@@ -1896,7 +1884,7 @@ def unmerge(self) -> list[CoordinateSystemManager]:
 
         Returns
         -------
-        List[`~weldx.transformations.CoordinateSystemManager`] :
+        list[`CoordinateSystemManager`] :
             A list containing previously merged `CoordinateSystemManager` instances.
 
         """
@@ -1941,7 +1929,7 @@ def subsystem_names(self) -> list[str]:
 
         Returns
         -------
-        List[str]:
+        list[str]:
             List with subsystem names.
 
         """
@@ -1953,7 +1941,7 @@ def subsystems(self) -> list[CoordinateSystemManager]:
 
         Returns
         -------
-        List :
+        list :
             List containing all the subsystems.
 
         """